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The 6.5mm Grendel is an intermediate cartridge jointly designed by British-American armorer Bill Alexander, competitive shooter Arne Brennan (of Houston, Texas) and Lapua ballistician Janne Pohjoispää, as a low-recoil, high-precision rifle cartridge specifically for the AR-15 platform at medium/long range (200–800 yard).
The .50 Beowulf rifle cartridge uses a rebated-rim design. This round is used in specialized AR-15 upper receivers, and the rim matches the size of the rim of the 7.62×39mm, allowing those parts to be used in the custom-built upper receivers. [8] Other rebated rifle cartridges include the .450 Bushmaster, .458 SOCOM, .500 Jeffery, and .375 ...
Civilian AR-15 rifles are commonly found with 1 in 12 inches (30 cm) or 54.8 calibers for older rifles and 1 in 9 inches (23 cm) or 41.1 calibers for most newer rifles, although some are made with 1 in 7 inches (18 cm) or 32 calibers twist rates, the same as used for the M16 rifle. Rifles, which generally fire longer, smaller diameter bullets ...
The CAR-15 name was an attempt to re-associate the AR-15 name with Colt, since the AR initially stood for ArmaLite, the original manufacturer of the ArmaLite AR-15. Colt later abandoned the CAR-15 concept, but continued to make carbine variations, using the " M16 " brand for select-fire models and the " Colt AR-15 " brand for semi-automatic models.
The scope base is the attachment interface on the rifle's receiver, onto which the scope rings or scope mount are fixed. Early telescopic sights almost all have the rings that are fastened directly into tapped screw holes on the receiver, hence having no additional scope base other than the receiver top itself.
The Canadian company Colt Canada (formerly Diemaco) licensed production of a rifle (Colt Model 715) and carbine (Colt Model 725), but later went on to produce an entire line of AR-15/M16 pattern weapons developed independently. In May 2005, Colt's Manufacturing Company acquired Diemaco, and the name was changed to Colt Canada.
The ring can be removed and replaced to refresh headspace control on older actions. The AW system cast steel bolt has a 0.75-inch (19.05 mm) diameter combined with gas relief holes in a 0.785 in (19.9 mm) diameter bolt body and front action bridge allowing high-pressure gases a channel of escape in the event of a cartridge-case head failure.
The SL40 is mounted on the rifle's bottom accessory rail and its trigger protrudes inside the rifle's trigger guard, and uses a Trijicon holographic sight for its sighting system. [ 84 ] [ 82 ] The SL40 is a derivative of the Steyr GL40 grenade launcher and weighs 1.025 kg (2.26 lb) and has a 180 mm (7.1 in) long barrel.