Misplaced Pages

#200799

119-624: The ArmaLite AR-18 is a gas-operated assault rifle chambered for 5.56×45mm NATO ammunition . The AR-18 was designed at ArmaLite in California by Arthur Miller, Eugene Stoner , George Sullivan, and Charles Dorchester in 1963 as an alternative to the Colt AR-15 design, a variant of which had just been selected by the U.S. military as the M16 . A semi-automatic version known as the AR-180

238-545: A French patent and submitted prototypes for testing by the French army in 1888 although the true date of their invention is uncertain. They would also produce a semi-automatic shotgun in the early 1890s. In 1889, the Austro-Hungarian Adolf Odkolek von Újezd filed a patent for the first successful gas-operated machine gun. Most current gas systems employ some type of piston. The face of the piston

357-454: A barrel that is screwed-in). Additionally the barrel has horizontal guide slots that help align and secure the handguards in place. To increase the weapon's accuracy during automatic fire, the AKM was fitted with a slant cut compensator that helps redirect expanding propellant gases upward and to the right during firing, which mitigates the rise of the muzzle during an automatic burst when held by

476-471: A barrel with a chrome-lined bore and four right-hand grooves at a 240 mm (1 in 9.45 in) or 31.5 calibers rifling twist rate . The forward barrel trunnion has a non-threaded socket for the barrel and a transverse hole for a pin that secures the barrel in place. The AKM's barrel is installed in the forward trunnion and pinned (as opposed to the AK-47, which has a one piece receiver with integral trunnions and

595-469: A black, glossy enamel painted finish . Starting with serial number S20001, a blued finish was used for the remainder of production. Rifles were normally equipped with a sling, cleaning kit (bore/brush), and a knife-type bayonet with scabbard. An optional bipod with a case was available. The AR-180 is capable of semi-automatic fire only and was externally identical in appearance to the AR-18 with one exception;

714-455: A cleaning rod capture or sling loop but is instead fitted with an integrated bayonet support collar that has a cleaning rod guide hole. The forward sling loop was relocated to the front handguard retainer cap. The handguard retainer also has notches that determine the position of the handguards on the barrel. The AKM's laminated wood handguards have lateral grooves that help securely grip the rifle. Gas relief ports that alleviate gas pressure in

833-448: A cyclic rate of fire of around 600 rounds per minute (RPM). The gas operated action has a large bolt carrier with a permanently attached long stroke gas piston. The gas chamber is located above the barrel. The bolt carrier rides on the two rails, formed on the side of the receiver, with a significant space between the moving and stationary parts. Compared with the AK-47, the AKM features detailed improvements and enhancements that optimized

952-429: A different accessory kit that contains a M1959 6H4 or 6H3-type bayonet and comes with synthetic or steel magazines. Both the 6H3 and 6H4 bayonet blade forms a wire-cutting device when coupled with its scabbard. The polymer grip and upper part of the scabbard provide insulation from the metal blade and bottom part of the metal scabbard, using a rubber insulator sleeve, to safely cut electrified wire. The kit also comes with

1071-468: A different magazine release and corresponding slot in the body of the magazine, meaning AR-15 magazines needed a new slot cut to fit properly in the AR-18. As a result, the AR-180B uses standard AR-15/M16 magazines. An AR-180B version with a Picatinny rail was planned for production. In 2007 the AR-180B was discontinued due to poor sales. There are aftermarket parts to improve the AR-180B. NoDak Spud made

1190-561: A direct-impingement (DI) gas operation system, but this was changed to a more conventional short-stroke gas piston in the AR-16 after ArmaLite sold the production rights to the DI system to Colt Firearms. The AR-16 had a short, 15-inch barrel, hinged wooden butt, and weighed 8.75 pounds empty; only three examples were built. Eugene Stoner left ArmaLite in 1961, shortly before Fairchild divested itself of ownership. The U.S. military's later adoption of

1309-404: A firearm unless it is regulated somehow. Most gas-operated firearms rely on tuning the gas port size, mass of operating parts, and spring pressures to function. Several other methods are employed to regulate the energy. The M1 carbine incorporates a very short piston, or "tappet." This movement is closely restricted by a shoulder recess. This mechanism inherently limits the amount of gas taken from

SECTION 10

#1732773056201

1428-409: A flat plate riveted to the left wall of the receiver housing and a support bracket fixed to the mounting base with screws. To shield the light-sensitive photo detector plate of the night vision sight, the weapon uses a slotted flash suppressor , which replaces the standard recoil compensator. The AKML can also be deployed in the prone position with a detachable barrel-mounted bipod that helps stabilise

1547-622: A full power cartridge. The direct impingement (DI) method of operation vents gas from partway down the barrel through a tube to the working parts of a rifle where they directly impinge on the bolt carrier. This results in a simpler, lighter mechanism. Firearms that use this system include the French MAS-40 from 1940, the Swedish Ag m/42 from 1942. The Stoner gas system of the American M16 , M4, and AR-15 style rifles utilize

1666-492: A gas piston-operated rifle and pistol which he claimed could be used with sliding, rotating or falling bolts. He would also patent a gas-operated revolver in 1886. Paulson did construct models of his rifle and tried them in France shortly after filing his patent. Furthermore, according to A. W. F. Taylerson, a firearms historian, his patented revolver was probably workable. In 1887, an American inventor called Henry Pitcher patented

1785-548: A gas-operated conversion system that he claimed could be applied to any manually-operated magazine rifle. In 1890 he would patent and submit an original gas-operated rifle for testing by the US government but it performed poorly and was ultimately never adopted despite being offered commercially for the civilian market. In the 1880s a gas piston-operated rifle and pistol were developed by the Clair Brothers of France who received

1904-428: A gas-operated repeating rifle but subsequently failed to develop that idea further. Between 1883 and 1885, Hiram Maxim filed several patents on blowback-, recoil-, and gas-operation. In 1885, one year after Maxim's first gas-operated patent, a British inventor called Richard Paulson, who a year before had patented a straight blowback-operated rifle and pistol, again, one year after Maxim’s first blowback patent, patented

2023-412: A hammer-release delaying device (installed on the same axis pin together with the trigger and disconnector) commonly called a "rate reducer" or "hammer retarder" ( Russian : замедлитель срабатывания курка ). In fact its primary purpose is not to reduce the rate of automatic fire; it is a safety device to ensure the weapon will only fire on automatic when the bolt is fully locked, as the hammer is tripped by

2142-527: A hesitation lock but not manufactured due to financial backing reasons. The ArmaLite brand was purchased in 1996 by Eagle Arms, a U.S. small arms manufacturer, which adopted the ArmaLite brand for its company. An updated model of the AR-180 was introduced in 2001 as the AR-180B, with a molded polymer lower receiver replacing the stamped steel original. The new lower receiver is combined with the buttstock, which

2261-467: A hole being drilled in the barrel. Both governments would first adopt weapons and later abandon the concept. Most earlier US M1 Garand rifles were retrofitted with long-stroke gas pistons, making the surviving gas trap rifles valuable in the collector's market. In the 1980s Soviet designer Alexander Adov from TsKIB SOO modified the concept with a tube diverting gas from the muzzle to a standard long stroke system (see below) in order to diminish influence of

2380-835: A light weight magazine with an aluminium body with a prominent reinforcing waffle rib pattern weighing 0.19 kg (0.42 lb) empty was developed for the AKM that proved to be too fragile and the small issued amount of these magazines were quickly withdrawn from service. As a replacement steel-reinforced 30-round plastic 7.62×39mm box magazines were introduced. These magazines discolour over time from yellowish to rust-coloured shades, weigh 0.24 kg (0.53 lb) empty and are often mistakenly identified as being made of Bakelite (a phenolic resin ), but were actually fabricated from two-parts of AG-4S moulding compound (a glass-reinforced phenol-formaldehyde binder impregnated composite), assembled using an epoxy resin adhesive. Noted for their durability, these magazines did, however, compromise

2499-422: A modified version of this where a gas tube delivers gas into the bolt carrier to impinge on the bolt, which acts as a piston to cycle the rifle. One principal advantage is that the moving parts are placed in-line with the bore axis meaning that sight picture is not disturbed as much. This offers a particular advantage for fully automatic mechanisms. It has the disadvantage of the high-temperature propellant gas (and

SECTION 20

#1732773056201

2618-415: A pin punch, an assembly pin to hold the trigger, disconnector and rate reducer together while putting these back into the receiver after cleaning the weapon, and a barrel brush. The kit is secured inside the butt stock via a spring-loaded trapdoor in the stock's pressed sheet metal butt cap. The stock is socketed into a stepped shaped rear trunnion with single upper tang and two screws. The rear trunnion itself

2737-406: A plane and then landing. The AKMP rifle uses subdued radium -illuminated aiming points integrated into the front and rear sight. These sights enable targets to be engaged in low-light conditions, e.g. when the battlefield is illuminated with flares, fires or muzzle flashes or when the target is visible as a shadow against an illuminated background. The sliding notch on the sight arm is then moved to

2856-671: A punch used to drive out various pins and a device that aids in assembling the rate reducing mechanism. The GP-25 Grenade launcher can also be fitted onto the AKM. There is also the PBS-1 silencer from the 1960s, designed to reduce the noise when firing, mostly used by Spetsnaz forces and the KGB. The weapon uses the same ammunition as the AK-47: the 7.62×39mm M43 intermediate rifle cartridge. The AKM mechanism's design principles and procedures for loading and firing are practically identical to those of

2975-421: A rare accessory today. A padded rifle case that could carry the rifle with the scope mounted was available. It could hold two spare 20-round magazines and the bipod or bayonet in pouches. Overall, the design is simple and effective with some clever touches; for example the bolt guide rod assembly guides the bolt in the receiver, retains the recoil springs and the rear end of the top handguard, as well as serving as

3094-444: A recording for its salesmen to distribute. The 1980s Republican political strategy of parallel political and paramilitary campaigns was also christened the " Armalite and ballot box strategy ". The standard AR-18 versions manufactured by ArmaLite, Howa and Sterling differ only in minor details. ArmaLite and Howa rifles have a satin grey phosphate finish, while Sterling rifles sported two finishes; Serial numbers S15001 through S20000 had

3213-473: A replacement black-anodized aluminum-alloy lower-receiver. StormWerkz made a series of stock adapters compatible with this model of lower receiver to allow the use of fixed or folding AR-180B or AR-15 stocks. StormWerkz also made an adapter that allowed the use of a Picatinny rail that comes in four variants and installs over the dovetail on the top of the receiver. The Canadian company Wolverine Supplies teamed up with Canadian gunmaker Kodiak Defence to commission

3332-629: A retractable polycarbonate stock and a railed handguard. It has a range of 400 meters and weighs less than 4 kilograms. DICI also makes the Diseños Casanave International LLC SC-2026C, a carbine version of the SC-2026 made for vehicle crews/personnel and for special forces operators. The STL-1A was made by Z111 Factory as early as 2015 by changing parts of used AKMs with new plastic handguards, folding buttstocks, pistol grips and muzzle brakes resembling

3451-417: A right-handed firer. The compensator is threaded on to the end of the barrel with a left-hand thread. Not all AKMs have slant compensators; some were also fitted with the older muzzle nut which came from the AK-47. Most AKMs with muzzle nuts were older production models. The AKM's slant compensator can also be used on the AK-47, which had a simple nut to cover the threads. The gas block in the AKM does not have

3570-414: A selective-fire rifle; 90 degrees from "SAFE" with the selector lever pointing down. Towards the end of AR-180 production at ArmaLite's Costa Mesa shop in 1972, some unused AR-18 lowers were used to assemble AR-180s. The "SEMI" and "AUTO" positions were scrubbed and the "AUTO" position was relabeled "FIRE". The selector lever on these particular rifles would have to be pivoted 180 degrees from "SAFE" to "FIRE"

3689-464: A short version, the AR-18S. This version uses the same basic mechanism and folding butt, but has a 257 mm (10.1 in) barrel and a length of 765 mm (30.1 in) with the butt extended. The shortened barrel is fitted with a cone-shaped flash suppressor to address the additional muzzle flash resulting from the short barrel. Some examples have an additional pistol grip fitted to the underside of

ArmaLite AR-18 - Misplaced Pages Continue

3808-410: A significant weight reduction and allow a soldier to carry more rounds for the same weight. Note: All 7.62×39mm AK magazines are backwards compatible with older AK variants. *10.12 kg (22.3 lb) is the maximum amount of ammo that the average soldier can comfortably carry. It also allows for best comparison of the three most common 7.62×39mm AK-style magazines. The AKM comes supplied with

3927-485: A small number of sporter variants called the AR-180 SCS, of which only 385 were reputed to have been made. It has a large single-piece wooden thumbhole stock that replaces the butt, pistol grip and handguard of conventional versions. The metal parts differ in the lack of the ejection port cover, a PH prefix to the serial number and adapted safety and magazine release controls. Sterling also manufactured small numbers of

4046-548: Is a variant of the Soviet-designed AK-47 (specifically Type 3) and AKM rifles . Production started in 1956 at State Factory 66 but was eventually handed over to Norinco and PolyTech , who continue to manufacture the rifle primarily for export. The Type 68 also known as Type 68 NK, is a North Korean version of the AKM, adopted in 1968 to replace the Type 58. It has no rate reducer. It has its own bayonet, which

4165-682: Is a version of the AKML with tritium sights (as in the AKMP). The AKMSP rifle is based on the folding stock AKMS variant but fitted with tritium night sights, as in the AKMP. The AKMSN model is derived from the AKMS and features an accessory rail used to mount a night vision sensor as seen on the AKML and additionally a flash hider and bipod. The left arm of the AKMSN's folding stock is bent outwards in order to avoid

4284-565: Is acted upon by combustion gas from a port in the barrel or a trap at the muzzle. Early guns, such as Browning's "flapper" prototype, the Bang rifle , and the Garand rifle , used relatively low-pressure gas from at or near the muzzle . This, combined with larger operating parts, reduced the strain on the mechanism. To simplify and lighten the firearm, gas from nearer the chamber needed to be used. This high- pressure gas has sufficient force to destroy

4403-824: Is an assault rifle designed by Soviet small arms designer Mikhail Kalashnikov in 1959. It was developed as the successor to the AK-47 adopted by the Soviet Union a decade prior. Introduced into service with the Soviet Army in 1959, the AKM was the most prevalent variant of the Kalashnikov rifles in the Warsaw Pact . The rifle was produced at the Tula Arms Plant and Izhmash factories in Russia. It

4522-477: Is available in 18.5, 16 and 10.5 in (470, 410 and 270 mm) barrel lengths. When the AR-18 was designed, a plethora of different methods of gas and recoil operation existed in self-loading intermediate caliber rifles. Since then, self-loading intermediate caliber rifles have converged toward three methods of gas operation. These are: AR-15 style direct impingement, the AK -style long stroke gas piston and

4641-526: Is based on the AK-47 bayonet, but it has a different pommel mount for it. These bayonets were also issued in Cuba, which have green scabbards instead of tan scabbards, which is used in the Korean People's Army. The WASR-10 is a semi-automatic only variant developed from the AKM series rifle but is not another version rather a derivative or variant due to significant changes. The lack of the dimple over

4760-427: Is fixed on the AR-180B, instead of the side-folding butt on the original AR-18 and AR-180. Other AR-180B changes include the use of standard AR-15 trigger group and rear sight parts, a straight cocking handle replacing the earlier cranked style and the deletion of the original AR-18/180 spring-loaded dust cover for the cocking handle slot. The AR-15 magazine release is also used, in contrast to the original AR-18 which had

4879-439: Is held to the stamped receiver with four rivets (two on each side). Under folding models instead have a U-shaped rear trunnion that reinforces the locking arms and is held to the receiver with six rivets (see Variants for more info). The AKM uses a modified recoil/return spring mechanism, which replaces the telescoping recoil spring guide rod with a dual U-shaped wire guide. The AKM has a modified trigger assembly, equipped with

ArmaLite AR-18 - Misplaced Pages Continue

4998-480: Is moved into and out of the locked position via a cam pin that engaged a helical slot in the bolt carrier, which rides on two metal guide rods (each with its own return spring) instead of contacting the receiver walls, providing additional clearance for foreign matter entering the receiver. Unlike the AR-15, the cocking handle fits directly into a recess in the bolt carrier and reciprocates with it during firing, allowing

5117-475: Is not locked but is pushed rearward by the expanding propellant gases as in other blowback-based designs. However, propellant gases are vented from the barrel into a cylinder with a piston that delays the opening of the bolt. It is used by Volkssturmgewehr 1-5 rifle, the Heckler & Koch P7 , Steyr GB and Walther CCP pistols. To avoid consuming a lot of relatively expensive rounds, many armies, including

5236-400: Is powered by a short-stroke gas piston above the barrel. The gas piston is of three-piece design to facilitate disassembly, with a hollow forward section with four radial gas vent holes fitting around a stainless steel gas block projecting rearwards from the foresight housing. The gas is vented from the barrel and travelled via a vent through the foresight housing into the hollow front section of

5355-532: Is similar to the second generation, but is darker coloured and has a matte non-reflective surface finish. The current issue steel-reinforced matte true black non-reflective surface finished 7.62×39mm 30-round magazines, fabricated from ABS plastic weigh 0.25 kg (0.55 lb) empty. Early steel AK-47 magazines are 9.75 in (248 mm) long, and the later ribbed steel AKM and newer plastic 7.62×39mm magazines are about 1 in (25 mm) shorter. The transition from steel to mainly plastic magazines yielded

5474-645: The 40 mm wz. 1974 Pallad grenade launcher was developed in Poland and designated the karabinek-granatnik wz. 1974. Produced locally. Examples include the MPi-KM (fixed stock) and MPi-KMS/MPi-KMS-72 (side-folding stock). East German guns used brown Bakelite furniture in place of wood. Diseños Casanave International LLC has made an upgraded version of the AKM known as the Diseños Casanave International LLC SC-2026, which has

5593-652: The AR Series 100 were approved for production. Production plans for the AR Series 100 would fail to push through as Elisco would be dissolved and its assets liquidated in the late 1980s. In mid-1968 ArmaLite set up pilot production in its Costa Mesa plant producing 1,171 AR-18s and 4,018 AR-180s between 1969 and 1972. Howa produced 3,927 AR-180s between 1970 and 1974. Sterling manufactured 12,362 AR-180s between 1979 and 1985. In all, just 21,478 AR-180s were manufactured over 16 years of production between 1969 and 1985. Unlike

5712-522: The AR-15 family of weapons for addressing the shortcomings of the Stoner internal gas piston operating system. It is a cross between a short-stroke gas piston and a M1 Garand type long-stroke gas piston system. It is similar to a regular short-stroke piston in operation because it too uses an open gas piston that has an impingement cavity at its head, that rests on a gas block on the barrel. However just like

5831-573: The Armalite AR-18 or the SKS . In either case, the energy is imparted in a short, abrupt push and the motion of the gas piston is then arrested, allowing the bolt carrier assembly to continue through the operating cycle through kinetic energy . This has the advantage of reducing the total mass of recoiling parts compared with a long-stroke piston. This, in turn, enables better control of the weapon due to less mass needing to be stopped at either end of

5950-453: The barrel . The M14 rifle and M60 GPMG use the White expansion and cutoff system to stop (cut off) gas from entering the cylinder once the piston has traveled a short distance. Most systems, however, vent excess gas into the atmosphere through slots, holes, or ports. A gas trap system involves "trapping" combustion gas as it leaves the muzzle. This gas impinges on a surface that converts

6069-420: The "ears" being angled with the back of the base instead of strait and its bottom portion is more narrow compared with the AK-47. Horizontal adjustment requires a special drift tool and is done by the armoury before issue or if the need arises by an armourer after issue. The sight line elements are approximately 48.5  mm (1.9  in ) over the bore axis. The " point-blank range " battle zero setting " П " on

SECTION 50

#1732773056201

6188-482: The 7.62×39mm AKM rear tangent sight element corresponds to a 300 m (328 yd) zero. For the AKM combined with service cartridges the 300 m battle zero setting limits the apparent "bullet rise" within approximately −5 to +31 cm (−2.0 to 12.2 in) relative to the line of sight. Soldiers are instructed to fire at any target within this range by simply placing the sights on the center of mass (the belt buckle, according to Russian and former Soviet doctrine) of

6307-465: The AK-47 was also replaced with a flat one on the AKM. All pieces are typically painted black instead of left unfinished ("in the white"). The buttstock, lower handguard and upper headguard are manufactured from birch plywood laminates like the later model AK-47 furniture. Such engineered woods are stronger and resist warping better than the conventional one-piece patterns, do not require lengthy maturing, and are cheaper. The wooden buttstock used in

6426-477: The AK-47). The AKM's notched rear tangent iron sight is calibrated in 100 m (109 yd) increments from 100 to 1,000 m (109 to 1,094 yd) and compared with the AK-47 the leaf's position teeth that secure the sliding adjustable notch were transferred over from the right to the left edge of the ramp. The front sight is a post adjustable for elevation in the field and has a slightly different shape with

6545-404: The AK-47, the only difference being the trigger assembly (during the return stage of the bolt carrier on fully automatic mode) as a result of incorporating the rate reducer device. The main variant of the AKM is the AKMS (S – Skladnoy – Folding), which was equipped with an under-folding metal shoulder stock in place of the fixed wooden stock. The metal stock of the AKMS is somewhat different from

6664-618: The AK-74, with an attachment lug for use with an M203 grenade launcher. In 2018, an upgrade, known as the STL-1B was developed, which included Picatinny rails, since the 1A uses a side-type attachment. The Pistol Mitralieră model 1963 (abbreviated PM md. 63 or simply md. 63) is a Romanian assault rifle chambered in the 7.62×39mm cartridge, patterned after the AKM. It is exported as AIM. The AK-63 (also known in Hungarian military service as

6783-445: The AKM is further hollowed in order to reduce weight and is longer and straighter than that of the AK-47, which assists accuracy for subsequent shots during rapid and automatic fire. The wooden stock also houses the issued cleaning kit, which is a small diameter metal tube with a twist lock cap. The kit normally contains the cleaning jag to which a piece of cloth material is wrapped around and dipped into cleaning solution. It also contains

6902-788: The AMM) is a Hungarian variant of the AKM assault rifle manufactured by the Fegyver- és Gépgyár (FÉG) state arms plant in Hungary . It is currently used by the Hungarian Ground Forces as its standard infantry weapon , and by most other branches of the Hungarian Defence Forces . The Type 56 ( Chinese : 56式自动步枪 ; literally; "Type 56 Automatic Rifle") also known as the AK-56, is a Chinese 7.62×39mm rifle. It

7021-481: The AR-15 gave legitimacy to its 5.56mm cartridge, and ArmaLite sought to develop a competing design chambered in 5.56mm that did not infringe on the Colt license agreement. With Stoner gone, it was decided to scale down the AR-16, and ArmaLite's new chief designer, Arthur Miller, embarked on the project. The resulting 5.56mm design appeared in 1963 and was named the AR-18. Miller later received U.S. patent 3,246,567 for

7140-490: The AR-15, ArmaLite's corporate owners Fairchild essentially gave up on the design, and sold the AR-15 production rights to Colt . Fairchild also spun off ArmaLite as an independent company, allowing the new owners to buy all of the company's designs except for the AR-10 and AR-15. When the U.S. military ultimately selected the AR-15 as the M16 , ArmaLite could no longer profit from its adoption. The ArmaLite AR-16 appeared in

7259-432: The AR-15. A dovetail is spot welded to the receiver in front of the rear sight for a proprietary ArmaLite quick-detachable scope mount . The magazines were of a brand new proprietary design and were different than those of the AR-15. The original magazines made by ArmaLite and Howa were of gray anodized aluminum alloy with black plastic followers and came in 5- and 20-round capacities. (The 5-round magazine, like that of

SECTION 60

#1732773056201

7378-549: The AR-15/M16, the AR-18 did not see substantial sales success, and was never officially adopted by any country as its standard service rifle. The reasons for this are unclear, but may have had something to do with the existing sales popularity of the AR-15/M16, as well as the need for additional field testing and evaluation of the Costa Mesa-produced rifles, which were still in the advanced prototype stage. The AR-18

7497-700: The AR-18 and AR-180. In 1983, ArmaLite was sold to Elisco Tool & Manufacturing of the Philippines, which planned to pitch the AR-18 as a replacement for the license-produced M16A1 then in service with the Armed Forces of the Philippines. As a result, production stopped in 1985 as the tooling was sent to the Philippines. Under Elisco several modifications to the design were implemented and twenty (20) prototypes of four designated types (AR 101, AR 102, AR 103, AR 104) were built and underwent testing and evaluation. About 3,500 of these rifles, collectively designated

7616-545: The AR-18 gas system and bolt carrier group. The Remington Adaptive Combat Rifle derives its bolt carrier group from the AR-18. Gas-operated reloading The first mention of using a gas piston in a single-shot breech-loading rifle comes from 1856, by the German Edward Lindner who patented his invention in the United States and Britain. In 1866, Englishman William Curtis filed the first patent on

7735-429: The AR-18 had military potential, it needed further development. In 1968, dissatisfied with efforts to market the AR-18, Arthur Miller left ArmaLite. Instead, the AR-180 was sold on the civilian market, while the AR-18 sold in small quantities to police and law enforcement organizations, as well as armies and security forces of nations such as Botswana , Haiti , Malaysia and Eswatini . Still others found their way into

7854-460: The AR-18 was sound, it required additional minor revisions and changes to improve safety and reliability before it could be considered for adoption as a service rifle. The British Ministry of Defence (MOD) tested the AR-18 in March 1966, and found the design unsatisfactory in performance during mud and sand trials. ArmaLite made several minor production modifications to the design commencing in 1965, and

7973-550: The AR-18's gas system. Successive rifle designs borrow other components such as the bolt carrier group or upper receiver. The HOWA Type 89 is an AR-18, modernized to fit the needs of the Japan Self-Defense Forces. The Singapore SAR-88 and Taiwanese T-91 utilize a complete AR-18 upper receiver. Early British SA80 prototypes featured ArmaLite produced AR-18 upper receivers mated to a prototype stamped metal bullpup lower receiver. The finalized SA80 weapon systems use

8092-559: The AR-18/180 was then sold to Howa of Japan, and the rifle was produced from 1970 until 1974, when new controls on export of military arms by the Japanese government forced the company to cease all small arms production. Between 1975 and 1978, there was a brief pause in production as ArmaLite was finalizing an agreement with Sterling Armaments Company, United Kingdom to produce the rifle under license. From 1979 until 1985, Sterling produced

8211-564: The AR-180 was later produced for the civilian market between 1969 and 1972. ArmaLite was never equipped to build small arms on a production basis, and the Costa Mesa AR-18 and AR-180 rifles frequently show evidence of hand-fitting. A production license was granted to Nederlandsche Wapen-en Munitiefabriek (NWM) of Den Bosch , the Netherlands, but it is doubtful that any AR-18 rifles were actually produced there. A license to produce

8330-535: The Colt AR-15 Sporter, was just a full-size 20-round magazine blocked to only hold 5 rounds.) They lacked the magazine catch cutouts of the AR-15 magazines, making them incompatible. Sterling Armaments Company later produced black-enameled steel magazines in 20- 30- and 40-round capacities that did have cutouts and were able to feed from an AR-15. However, the AR-18/AR-180 was never capable of using

8449-593: The Colt AR-15/M16's stock 20- or 30-round STANAG magazines. Gunsmiths have been able to convert AR-15/M16 magazines to feed in the AR-18, though they require modified followers or they will put strain on the bolt catch. The AR-18 was also designed to use the same standard accessories as the M16. It used a three-pronged flash hider that was similar to that used on the early M16. This was usually replaced by an aftermarket enclosed M16A1 "birdcage"-type model. It could mount

8568-551: The Russian method for determining accuracy, which is far more complex than Western methods. In the West, one fires a group of shots into the target and then simply measures the overall diameter of the group. The Russians, on the other hand, fire a group of shots into the target. They then draw two circles on the target, one for the maximum vertical dispersion of hits and one for the maximum horizontal dispersion of hits. They then disregard

8687-570: The U-shaped receiver using rivets . The receiver housing also features a rigid tubular cross-section support that adds structural strength. Guide rails that assist the bolt carrier's movement which also incorporates the ejector are installed inside the receiver through spot welding . As a weight-saving measure, the stamped receiver cover is of thinner gauge metal than that of the AK-47. In order to maintain strength and durability it employs both longitudinal and latitudinal reinforcing ribs. The AKM has

8806-466: The U.S. Army was directed to re-evaluate the AR-18 at the end of 1969. Testing was conducted at Aberdeen Proving Grounds, conducted by arsenal employees and the Infantry Board at Fort Benning , Georgia. However, American procurement officials were not interested in acquiring yet another 5.56 mm service rifle. A number of deficiencies were listed and the testing authority stated that, although

8925-494: The United States Army, trained machine gun crews with less-expensive sub-caliber ammunition in the late 19th century and the first half of the 20th century. To do this, they needed a cheap .22 LR cartridge to operate firearms designed to use the .30-06 cartridge. David Marshall Williams invented a method that involved a separate floating chamber that acted as a gas piston with combustion gas impinging directly on

9044-710: The accompanying fouling) being blown directly into the action parts. Direct impingement operation increases the amount of heat that is deposited in the receiver while firing, which can burn off and cover up lubricants. The bolt, extractor, ejector, pins, and springs are also heated by the same high-temperature gas. These combined factors reduce service life of these parts, reliability, and mean time between failures . Several other uses have been found for exhaust gases other than to aid cycling: AKM The AKM (Russian: Автомат Калашникова модернизированный , romanized : Avtomat Kalashnikova modernizirovanny , lit. 'Kalashnikov's Automatic Rifle Modernised')

9163-424: The adoption of the 7.62×51mm NATO M14 rifle in 1957, the U.S. Army's Continental Army Command (CONARC) began an investigation of small-caliber, high-velocity (SCHV) rifles as an offshoot of the military's existing research program, Project SALVO . ArmaLite and Winchester Arms were solicited by CONARC to provide prototype automatic rifles chambered for high-velocity centerfire .22 rounds. The ArmaLite AR-15

9282-483: The bolt carrier travel and prevents hot combustion gases from being pushed into the internals and removes powder residue in the receiver which significantly improves reliability, increasing the lifespan of weapon parts by reducing instances of malfunctions under prolonged periods of extreme high rate of fire and suppressed shooting. The short-stroke operating system is available both on military ( HK416 lineage , LMT MARS ) and civilian markets as an alternative or retrofit to

9401-413: The bolt carrier's last few millimetres of forward movement. The device also reduces "trigger slap" or "trigger bounce" and the weapon's rate of fire, which also reduces the dispersion of bullets when firing in fully automatic mode. The hammer was also changed and equipped with a protrusion that engages the rate reducer and the trigger has only one notched hammer release arm (compared with two parallel arms in

9520-552: The creation of a new AR-180 variant, the WK180-C. The WK180-C does away with the stamped steel and polymer construction of the AR-18, AR-180, and AR-180B, instead, it uses 6061-T6 aluminium to form the upper and lower receivers. This rifle ships with an adaptor to mount AR-15 style stocks (and comes with a collapsible AR15 stock). As Length of pull (LOP) is long with many AR15 stocks, some users have retrofit Cz Vz58 folding stocks to these rifles. While this option works well, it requires

9639-475: The enemy target. Any errors in range estimation are tactically irrelevant, as a well-aimed shot will hit the torso of the enemy soldier. The early slab-sided steel AK-47 30-round detachable box magazines had 1 mm (0.039 in) sheet-metal bodies and weigh 0.43 kg (0.95 lb) empty. The later steel AKM 30-round magazines had lighter sheet-metal bodies with prominent reinforcing ribs weighing 0.33 kg (0.73 lb) empty. To further reduce weight

9758-406: The energy to motion that, in turn, cycles the action of the firearm. As the resulting motion is forward toward the muzzle of the gun, some sort of mechanical system is needed to translate this into the rearward motion needed to operate the bolt. This adds to the complexity of the mechanism and its weight, and the placement of the trap generally results in a longer weapon and allows dirt to easily enter

9877-447: The firer to force the breech closed or open if necessary. The cocking handle slot has a spring-loaded cover that can be closed by the user to prevent debris entering the receiver, and it will open automatically as the bolt carrier moves rearwards after the first shot. The recoil springs are housed within the receiver, differing from the AR-15 which houses its more elaborate buffer mechanism in the buttstock. The AR-18's compact design enables

9996-458: The folding stock of the previous AKS-47 model as it has a modified locking mechanism, which locks both support arms of the AKMS stock instead of just one (left arm) as in the AKS-47 folding model. It is also made of riveted steel pressings, instead of the milled versions of most AKS-47s, and is more inline like the fixed stock AKM. Due to the stamped receiver, it also has a reinforcement plate beneath

10115-438: The front of the floating chamber. The .22 caliber Colt Service Ace conversion kit for the .45 caliber M1911 pistol also used Williams' system, which allows a much heavier slide than other conversions operating on the unaugmented blowback mechanism and makes training with the converted pistol realistic. A floating chamber provides additional force to operate the heavier slide, providing a felt recoil level similar to that of

10234-530: The gas engine on barrel and increase accuracy, but his sniper rifle wasn't adopted due to the dissolution of the Soviet Union . With a long-stroke system, the piston is mechanically fixed to the bolt group and moves through the entire operating cycle. This system is used in weapons such as the Bren light machine gun , AK-47 , Tavor , FN Minimi , FN MAG , FN FNC , and M1 Garand . The primary advantage of

10353-541: The handguard. Sterling had also planned to market a pistol version of the AR-18S to complement the standard AR-180, known as the AR-180SP. A single prototype AR-180SP was completed and submitted to the ATF in 1982 to determine if it was suitable for importation, but it is not known if it was ever approved for import or if any more examples were imported beyond the lone prototype sent to ATF. A 2.75 × 20 mm telescopic sight

10472-699: The hands of paramilitary groups, such as the Provisional Irish Republican Army (IRA) in Northern Ireland, (see also Provisional IRA arms importation ). The ArmaLite rifle was for many years the most lethal weapon available to the IRA. For this reason, it became an iconic symbol within that movement. An Irish rebel song , " Little Armalite ", focuses on the role played by the AR-18 in the Provisional Irish Republican Army campaign . The Armalite company reportedly bought 1000 copies of

10591-400: The hits on the outer part of the target and only count half of the hits (50% or R 50 ) on the inner part of the circles. This dramatically reduces the overall diameter of the groups. They then use both the vertical and horizontal measurements of the reduced groups to measure accuracy. This circular error probable method used by the Russian and other European militaries cannot be converted and

10710-458: The latch holding the upper and lower receivers together in the closed position. Disassembly is somewhat similar to the AR-15, with the working parts accessed by the rifle pivoting open on a hinge pin immediately forward of the magazine well. The AR-18 was put into limited production at ArmaLite's machine shop and offices in Costa Mesa, California. A semi-automatic version of the AR-18 known as

10829-558: The later 1950s. The AR-16, a 7.62mm NATO selective-fire rifle, was Eugene Stoner 's final design for ArmaLite. The AR-16 and its predecessor, the AR-12 were designed by Stoner in response to demands by the military forces of smaller, less developed nations for a less expensive, yet state-of-the-art selective-fire military rifle that unlike the AR-10 and AR-15, could be produced inexpensively of heavy-gauge sheet metal using automatic screw machines, lathes, and presses. The AR-12 originally featured

10948-501: The long-stroke gas piston system used on the M1 Garand the piston assembly is integrated with the operating rod and moves with the bolt group. The caveat of this system is that it has heavier moving mass than modern long-stroke gas piston systems used on rifles like the AK-47 , Tavor , FN FNC , etc. Hence firearms using this system do have higher felt recoil than their equivalent modern long-stroke gas piston counterparts. The bolt

11067-403: The long-stroke system is that the mass of the piston rod adds to the momentum of the bolt carrier enabling more positive extraction, ejection, chambering, and locking. The primary disadvantage to this system is the disruption of the point of aim due to several factors such as: the center of mass changing during the action cycle, abrupt stops at the beginning and end of bolt carrier travel, and

11186-601: The magazine well is a peculiar WASR feature helpful in identification of WASR series rifles . The WASR series are manufactured in Romania by the arms-maker Cugir and widely imported into the United States for the sporting gun market by importer Century International Arms who modifies them with TAPCO stocks. Century began installing the TAPCO Intrafuse AK G2 trigger group in 2007 to eliminate bolt slap trigger finger injuries. The following table represents

11305-648: The manufacture of military rifles in the West in the early 1960s, which had, until then, largely retained the use of traditional machined forgings. Compared to the smooth lines of the AR-15, which had demonstrably finer tolerances in parts fit, the AR-18 faced criticism over its stamped and welded construction. However, the rifle proved to be both reliable and very accurate at all ranges up to 460 metres (500 yards). Its simple construction promised significantly reduced production costs, and allowed it to be license-produced locally on less advanced machinery, potentially reducing dependence on foreign manufacturers. The AR-18's action

11424-400: The mechanism. Despite these disadvantages, they use relatively low pressure gas and do not require a hole in the barrel, which made them attractive in early designs. The system is no longer used in modern weapons. Hiram Maxim patented a muzzle-cup system in 1884 described in U.S. patent 319,596 though it is unknown if this firearm was ever prototyped. John Browning used gas trapped at

11543-617: The muzzle to operate a "flapper" in the earliest prototype gas-operated firearm described in U.S. patent 471,782 , and used a slight variation of this design on the M1895 Colt–Browning machine gun "potato digger". The Danish Bang rifle used a muzzle cup blown forward by muzzle gas to operate the action through transfer bars and leverage. Other gas-trap rifles were early production M1 Garands and German Gewehr 41 (both Walther and Mauser models). The American and German governments both had requirements that their guns operated without

11662-442: The pistol grip spot welded in place to prevent damage to the receiver if the gun is dropped on its pistol grip as well as better absorb the recoil with the stock folded. The AKM was produced in the following versions: AKMP, AKML and AKMLP, whereas the AKMS led to the following models – AKMSP, AKMSN and AKMSNP. It is designed especially for use by paratroopers–as the folding stock permits more space for other equipment when jumping from

11781-409: The piston cylinder (placed horizontally in a row on the gas cylinder in the AK-47) were moved forward to the gas block and placed in a radial arrangement. The AKM's bolt carrier has a lightening cut milled into the right side halfway before the handle. The handle has its profile slimmed down too. The stem of the AKM bolt is fluted in another measure to help reduce weight. The round, fluted firing pin of

11900-415: The piston, which causes it to move rearwards a short distance. The rear end of the piston emerges through the barrel extension to contact the forward face of the bolt carrier, causing it in turn to move rearwards. The bolt itself is of similar configuration to the AR-15 with seven radial locking lugs engaging corresponding recesses in the barrel extension, and the extractor in place of the eighth lug. The bolt

12019-421: The rifle for mass production; some parts and assemblies were conceived using simplified manufacturing methods. Notably, the AK-47's milled steel receiver was replaced by a U-shaped steel stamping. As a result of these modifications, the AKM's weight was reduced by ≈ 1 kg (2.2 lb), the accuracy during automatic fire was increased and several reliability issues were addressed. The AK-47's chrome-lined barrel

12138-561: The rifle in 1969. Overall, the new AR-18 rifle is much more conventional than previous ArmaLite designs, although it uses the relatively new stamped steel construction from its predecessor, the AR-16. Despite being pioneered by the Germans during WW2 in weapons such as the MP 44 , and later adopted for the Soviet AKM , the use of stamped and welded sheet metal components was still uncommon in

12257-460: The rifle's camouflage and lacked the small horizontal reinforcing ribs running down both sides of the magazine body near the front that were added on all later plastic magazine generations. A second generation steel-reinforced dark-brown (colour shades vary from maroon to plum to near black ) 30-round 7.62×39mm magazine was introduced in the early 1980s, fabricated from ABS plastic. The third generation steel-reinforced 30-round 7.62×39mm magazine

12376-403: The same way as Howa manufactured rifles. Sterling made an AR-180 sporter variant called the "Sharpshooter". It was identical to the regular AR-180 except it came with black neoprene covers for the forend and buttstock. The forend cover gave the shooter a positive gripping surface and the buttstock cover contained a cheekpiece pad to help gain a full cheekweld when shooting. Sterling manufactured

12495-527: The selector has only two positions, omitting the third "AUTO" position found on the AR-18. There are minor differences between the variants; to select "FIRE" on the Howa rifles the selector lever must be pivoted 180 degrees from "SAFE" so it is pointing forward towards the muzzle (where "AUTO" would be on a selective-fire rifle), while on the Sterling rifles, the "SEMI" position is the same as the "SEMI" position on

12614-708: The short-stroke gas system found in the AR-18 rifle. While the AK and AR-15 are the first and second most produced intermediate caliber rifles of all time , the AR-18 gas system is the ancestor for the majority of short stroke gas systems found in selective fire military rifles. The AR-18 mechanism is the basis for many rifles in major military service. Rifles which use a copy or derivative of the AR-18 gas system include: HK G36 , HK416 , FN F2000 , FN-SCAR , Steyr AUG , CZ 805 BREN , Chinese QBZ-95 , HOWA Type 89 , SAR-88, T65 , T86 , T91 , T112 and British SA80 family of weapon systems. In some cases, designs borrow more than just

12733-626: The sight mount bracket during folding and the sling loop was moved further to the rear. Similarly to the AKMN-1, the AKMSN-1 can mount the multi-model night vision scope 1PN51 and the AKMSN2 the multi-model night vision scope 1PN58. A version of the AKMSN additionally supplied with factory tritium night sights is called the AKMSNP. A version of the AKM with a modified lower handguard designed to accept

12852-443: The standard M7 bayonet , although it was not available for sale through ArmaLite. "Sporterized" late-production Howa-made AR-180 rifles had extended metal tabs through the mounting lugs to prevent this. A plastic copy of the fixed folding metal bipod issued with the early M-16 was available and came in a similar protective case. AR-180 users were leery of buying a non-adjustable bipod made of thermoset plastic so few were sold, making it

12971-420: The use of a side-folding stock with a hinging mechanism (which proved to be less than adequately rigid). The sights are of similar design and sight picture to those of the AR-15 - a 2-position flip aperture rear sight and post foresight - but the rear sight is made of stampings. A notable change is the use of a more conventional lower sight line closer to the axis of the bore, in contrast to the elevated sights of

13090-483: The use of lower iron sights and optics. In 2019 Brownells, Inc. released BRN-180 complete upper assembly, a new take on the AR-180 design built around the AR-18 short-stroke piston system. The BRN-180 is designed to be fitted to mil-spec AR-15 lower receivers and unlike standard AR-15s the BRN-180 can be fired with the stock folded. The BRN-180 comes with an adjustable gas block and a free-floating modular handguard and

13209-459: The use of the barrel as a fulcrum to drive the bolt back. Also, due to the greater mass of moving parts, more gas is required to operate the system that, in turn, requires larger operating parts. With a short-stroke or tappet system, the piston moves separately from the bolt group. It may directly push the bolt group parts, as in the M1 carbine , or operate through a connecting rod or assembly, as in

13328-464: The weapon and reduces operator fatigue during prolonged periods of observation. The bipod is supplied as an accessory and is carried in a holster attached to the duty belt. The AKMN comes equipped with a side-rail used to attach a night vision device. The model designated AKMN-1 can thus mount the multi-model night vision scope 1PN51 and the AKMN2 the multi-model night vision scope 1PN58 . The AKMLP

13447-450: The “S” setting (which corresponds to the “3” setting in the AKM). The sight itself is guided on the sliding scale and has a socket, which contains a tritium gas-filled capsule directly beneath the day-time notch. The tritium front post installs into the front sight base using a detent and spring. The AKML comes equipped with a side-rail used to attach a night vision device . The mount comprises

13566-569: Was a scaled-down version of the 7.62mm AR-10 , which had appeared too late to be a serious contender against the M14 for adoption by the US Army. Its competitor was the Winchester .224 Light Rifle, a "Carbine" Williams prototype carbine design in a .22 high velocity round which was similar to, but not interchangeable with, the .223 Remington (5.56×45mm). During the protracted U.S. military trials of

13685-431: Was available but few were sold. Early-production models are marked in meters rather than yards and have a different reticle. It is marked "ArmaLite", and has a quick-detachable, see-through mount that attaches to an integral dovetail spot-welded to the top of the receiver. The mount could also feasibly be used with other scopes if they had a 1-inch diameter tube. A delayed-blowback upper was also developed by Ross Rudd using

13804-504: Was eventually replaced by the AK-74 in 1974. The AKM maintains the AK-47's wood stock , but has simpler individual parts that are favorable for mass production . Like the AK-47, many variants of the AKM exist such as the AKMS, AKML, and AKMP. The AKM is an automatic rifle chambered in 7.62×39mm intermediate cartridge. It is a selective fire, gas operated with a rotating bolt , firing in either semi-automatic or fully automatic, and has

13923-869: Was later produced for the civilian market. While the AR-18 was never adopted as the standard service rifle of any nation, its production license was sold to companies in Japan and the United Kingdom, and it is said to have influenced many later weapons such as the British SA80 , the Singaporean SAR-80 and SR-88 , the Belgian FN F2000 , the Japanese Howa Type 89 and the German Heckler and Koch G36 . Soon after

14042-401: Was purchased for evaluation trials by various armed forces, including the United States (1964) and the United Kingdom (1966). These suffered various malfunctions during evaluation trials by various nations. During the US trials at Aberdeen Proving Ground in 1964, the AR-18's functioning was found to vary from lot to lot of ammunition. The evaluating board concluded that while the basic design of

14161-442: Was retained, a common feature of Soviet weapons which resists wear and corrosion, particularly under harsh field conditions and near-universal Eastern Bloc use of corrosively primed ammunition. The AKM's receiver is stamped from a smooth 1.0 mm (0.04 in) sheet of steel , compared with the AK-47 where the receiver was machined from a solid block of steel. A rear stock trunnion and forward barrel trunnion are fastened to

#200799