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33-443: M500 may refer to : Haskins m500 , a .50 calibre round sniper rifle Mossberg 500 , a 12-gauge shotgun Smith & Wesson Model 500 , a .50 caliber revolver Palm m500 series , a 2001 handheld personal digital assistant a SoundBridge digital Internet radio model [REDACTED] Topics referred to by the same term This disambiguation page lists articles associated with

66-412: A ballistic table ). The latter is particularly relevant at very close ranges (e.g. 15 meters [49 feet]), while at longer distances, such as in long range shooting , the scope height has less impact on the ballistic calculations. The height of a scope sight can be measured in many ways. With regard to ballistic calculations, it is generally only measured from the center of the bore axis to the center of

99-509: A base attached to the firearm and rings (usually two) attached to the sight. The rings are usually made of steel or aluminum. Common diameters on ring mounts are 25.4 mm (1 inch), 26 mm, 30 mm and 34 mm. There are big differences in the strength and ability of sustained precision on different assemblies. With weak cartridges such as .22 LR applied in light-use scenarios, a pair of skinny aluminium rings may work well, while firearms with very powerful recoil often combined with

132-421: A complete scope mount assembly, but is most often used to refer to the lower part of a two-part scope mount assembly. The firearm interface which sits on the firearm and to which the scope mount is attached is often called the base or rail . Some types of bases are: On receivers without an integrated attachment for mounting a scope, for example, an integrated Picatinny rail, the base is usually screwed on as

165-486: A heavy sight may require steel rings or thicker aluminum rings with recoil lugs to be used. Scopes for ring mounts are available in many different sizes. The most common ones are: Some less common standards are: For a ring assembly to grip evenly, it is important that the scope rings are circular and coaxial with the scope tube. On ring mounts that grip unevenly, the ring mount can be lapped to prevent uneven pressure when mounting. One scopes made for ring mounts, it

198-446: A longer distance between the front and rear screw holes, and therefore continuous scope mount assemblies for the 700 LA do not fit on the 700 SA nor the above-mentioned firearms. However, two-piece scope mounts in general interchange for the mentioned models. Bases with a rounded bottom for mounting on a round receiver bridges should ideally have a slightly smaller radius than the receiver in order to provide two points of contact and give

231-407: A radius on the front bridge and a flat on the rear bridge. Quick release (QR) can refer to several different variants of scope mounts which can be mounted and disassembled quickly without tools. In some cases, it may be relevant to add extra inclination to the scope to be able to shoot at longer (or shorter) distance. For example, this is popular for long range shooting , where it is common to use

264-561: A separate part. Such mounts are often model-specific to the firearm, and depend on factors such as the radius of the receiver bridge, the type of screw and the distance between the screw holes. A common fastening method is by screws. These are often metric M3.5x0.6 mm or US #6–48 (⌀ 3.5 mm, 0.53 mm pitch) or #8–40 (⌀ 4.2 mm, 0.64 mm pitch). Many European assemblies use M3.5 screws, such as SAKO Optilock, Recknagel and original CZ rings. Since #6–48 and M3.5x0.6 have near identical diameters and almost equal pitch , there

297-622: A stable attachment. Conversely, a slightly too large radius on the mount will result in just one point of contact and a less stable attachment. In the table below, the radius refers to the curvature of the mounting surface on the receiver bridge. The base is often attached with two screws on the front receiver bridge and two screws on the rear receiver bridge, but sometimes with several more screws. The hole distances are measured from center-to-center. Some common hole distances are 12.7, 15.37 and 21.84 mm (0.500, 0.605 and 0.860 in) respectively). The two front screws are referred to in

330-414: A tilt of 6  mrad (20 MOA ). Extra tilt can be achieved several ways, like for example with a tilted Picatiny rail (e.g. 6 mrad tilt), with bases or rings (e.g. 6 mrad tilt) or with special insert rings (e.g. Burris Pos-Align). The height of scope sight can be important for the cheek rest support (often called cheek weld ) to gain correct eye placement, as well as for calculating ballistics (e.g.

363-474: Is a potential for confusion, and upon mixing the wrong screw will enter the threads, but will gradually become tighter to screw until the thread is destroyed. In case of damage, the hole must often be drilled and re-threaded, and M4x0.7 or #8–40 may then be relevant alternatives. The Remington 700 Short Action (SA) scope base attachment pattern is particularly widespread, and is for example used on models such as: The Remington 700 Long Action (LA) naturally has

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396-528: Is not uncommon to get ring marks when mounting the rings. There are insert rings on the market which allows for mounting a scope inside a ring mount of a larger diameter. An example could be to mount a scope with a 1-inch (25.4 mm) tube in a 30 mm mount using a plastic insert. There are also special ring mounts in the market with circularly shaped ring inserts made to provide stress free mounting without lapping, with Burris Signature Rings and Sako Optilock Rings as two well-known examples. Burris Signature

429-424: Is usually meant an interconnecting part between the scope and the firearm. For example, a base may have a picatinny attachment on the underside, while the upper side may have either a ring (e.g. 30 mm) or rail mounting (e.g. Zeiss rail). On some assemblies, the upper and lower parts of the base are separate parts that must be screwed together and fastened to a specified torque. A base can thus sometimes constitute

462-473: The de facto industry standard for scope mounting rails. The system has so far seen most use on the European high end market. The Swarovski SR rail (patented in 2002, introduced in 2005 The Swarovski SR rail is also used by Kahles, a Swarovski subsidiary. ) has a flat rail with many "teeth" as recoil lugs, and is only offered on scopes from Swarovski and its subsidiary Kahles. It separates itself from

495-520: The 8.58×71mm , was eventually developed by the Lapua-Nammo Oy company in Finland into the .338 Lapua Magnum . The Haskins was a bolt-action, magazine -fed weapon, featuring a steel receiver with a rotating bolt . The bolt had 3 long lugs which locked into the receiver walls. The weapon could use one of two cartridges: the 7.62×51mm NATO and the 8.58×71 mm. Switching between calibers

528-408: The barrel or stock ). Since the mid-20th century, dovetail rails , where the mount is slided over a straight dovetail bracket with an inverted isosceles trapezoid cross-section and fixed tight in position with clamping screws, became more common due to the ease of installation and removal. Later, the hexagonally cross-sectioned rail interface systems such as Weaver rail became popular and

561-508: The Zeiss rail in that it is not neither stepless nor self-centering. A former competing standard was the halv-circle shaped Schmidt & Bender Convex rail also introduced in 2005. Schmidt & Bender after a few years changed to the Zeiss rail standard. In contrast to the Zeiss and Swarovski systems, the S&;B Convex rail had the possibility to add a cant to the scope when mounting, such that

594-570: The after shock directly onto the shooter and spotter (not a pleasant experience). The Haskins featured a detachable scope mount , heavy precision barrel, a folding bipod , a fully adjustable trigger and could be disassembled for ease of carry and storage. The Haskins was used by the Provisional Irish Republican Army to fire upon British troops in Northern Ireland . It became highly feared; this weapon

627-471: The lighter rifle, but purchased a small number of the .50 caliber rifles. They are now used by some United States Army Special Forces snipers. The Haskins m500 sniper rifle fires a .50 caliber round as far as 2 km and can still hit a target the size of a garbage bin. Although not adopted in large numbers by the US, the weapon served as a testbed for new sniper ammunition. The cartridge originally used,

660-450: The list below as screws 1 and 2, and the front hole spacing is thus referred to as «distance 1–2». In the same way, the rear hole distance is called «distance 3–4». The distance between these is largely determined by the receiver length, and is stated here as «distance 2–3» *The radius is similar, but the screw types used vary 0–13.2 mm *Newer models have a radius on both the front and rear receiver bridges, while older models have

693-422: The receiver. The Haskins is an extremely accurate system. I have personally fired this weapon out to 1800 meters and acquired about an 80% first round hit probability. The weapon uses a removable muzzle brake, which at one time allowed the shooter to choose between several types of brakes. A note of caution here to anyone encountering this system. It is possible to install the muzzle brake on backwards which will send

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726-481: The reticle is not horizontal to the ground. There is an older European system with an upside-down V-shape (70 degrees). This system has little widespread use today. The advantage of this system was that it at one time was offered by most European scope manufacturers, but the disadvantage was that the rail had to be drilled for a screw each time the eye relief was to be adjusted. All new standards for rail mounts have addressed this issue. Ring mounts usually consist of

759-663: The rings with the circular insertes was considered to have expired in 2014, and as of 2020 is listed as "definitely expired". In 2015, XTR Signature Rings was launched as a further development of the Burris Signature series. The XTR variant differs in that it has two circular cavities per ring assembly versus one. A patent for the XTR Signature Rings was applied for in 2016, and was granted to Burris in 2019. Many reflex sights (e.g. red dot sights) and holographic sights have proprietary mounts. By bases,

792-513: The same title formed as a letter–number combination. If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=M500&oldid=1086679082 " Category : Letter–number combination disambiguation pages Hidden categories: Short description is different from Wikidata All article disambiguation pages All disambiguation pages Haskins m500 The Haskins

825-404: The scope sight ( sightline ). With regard to cheek support, several methods are used: On firearms with a picatinny rail, the height is measured from the top of the picatinny rail on the firearm. On most other types of bases it is common to measure from the top radius of the receiver bridge. When the bottom measuring point is determined, the height is then measured up to either the optical center or

858-537: The section on Link between scope and firearm ). Scope mounts may be offered by firearm and scope manufacturers, or bought as aftermarket accessories. Among scopes for rail mounts, the 22.5-degree V-shaped Zeiss rail is the most prevalent standard. It was introduced in 1990. After the patent expired in 2008, compatible scopes have been offered from manufacturers such as Blaser , Leica , Minox , Meopta , Nikon , Noblex (formerly Docter ), Schmidt & Bender and Steiner . It has therefore, in some sense, become

891-472: The use of torque screwdrivers ), but sometimes they are manually tightened via thumbscrews , and may even have Quick Release (QR) designs. As of 2020, the Picatinny rail is arguably the most widespread scope mounting standard for new firearms, although there are many proprietary and brand-specific types of mounts that can either be used with Picatinny rails, or as completely different design alternatives (see

924-435: The weapon. Words such as mounts and bases are used somewhat loosely, and can refer to several different parts which are either used together or in place of each other as ways to mount optical sights to firearms. Attachment interfaces for scope mounts vary according to weapon design and user choice. Traditionally scope mounts are fastened onto firearms via tapped screw holes (usually on the receiver ) and/or clamps (onto

957-458: Was developed from a US Army requirement for an antimaterial capability. Standard 7.62×51mm sniper rifles were unable to meet the penetration requirements. Several experimental cartridges were produced, culminating in a convertible lightweight bolt-action rifle able to use .50 caliber machine-gun cartridges, or a lighter, faster, then-wildcat cartridge optimized for antipersonnel use, with some antimaterial ability. The US Army declined to purchase

990-497: Was introduced in 1995. A patent was applied for in 1994, and was granted in 1995. Sako Optilock has been sold since some time in the early 2000s. The trade name Optilock was registered in the US in December 1997, and has been marketed in the US since December 2001. In 2000, Sako was sold to Beretta Holding . In 2002, Burris was also sold to Beretta Holding, and thus Burris and Sako got the same owners. Burris' original patent for

1023-650: Was later modified into the Picatinny rail in the early 1990s, which became the standardized military-use mounting interface for NATO troops in 1995. The Picatinny rail was officially replaced by the metrified NATO Accessory Rail for military use in 2009, although it remained popular in the civilian market for both scope and accessory mounting. Scope mounts can be either one-piece (a single implement with multiple clamping rings) or multi-piece (usually two or more individual scope rings). These mounts are usually fastened with screws to specified tensions (which warrants

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1056-407: Was relatively simple, requiring that only the barrel and bolt head be replaced. William Brophy, an American Army Ordnance officer when discussing comparable weapons stated: The Haskins .50 caliber is a single shot rifle requiring the shooter to remove the bolt after each round is fired. The shooter actually places the rim of the cartridge into a slot on the bolt, then inserts this combination into

1089-514: Was the cause of many deaths. Scope mount Scope mounts are rigid implements used to attach (typically) a telescopic sight or other types of optical sights onto a firearm . The mount can be made integral to the scope body (such as the Zeiss rail ) or, more commonly, an external fitting that clamp onto the scope tube via screw -tightened rings (similar to pipe shoes ). The scope and mount are then fastened onto compatible interfaces on

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