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ArmaLite Early ArmaLite AR-15 ultra-lightweight 'Hollywood' turned-down profile barrel, 1:14 twist only A1 : Also referred to as the "lightweight" or "pencil" profile. Government-specified barrel profile increased to between 0.675 and 0.575 inches
The AR-15 rifle usually comes chambered for either the military cartridge 5.56×45mm or the .223 Remington. Because of the pressures associated with the 5.56×45mm, it is not advisable to fire 5.56×45mm rounds in an AR-15 marked as .223 Remington, since this can result in damage to the rifle or injury to the shooter. [1]
The first version produced for commercial sale by Colt was the SP1 model AR-15 Sporter in .223 Remington, with a 20-inch (51 cm) barrel and issued with five-round magazines. [21] Initial sales of the Colt AR-15 were slow, primarily due to its fixed sights and carry handle that made scopes difficult to mount and awkward to use. [ 84 ]
The standard AR-15 rifle has a 500 mm (19.69-inch) sight radius. [15] The AR-15 uses an L-type flip, aperture rear sight and it is adjustable with two settings, 0 to 300 meters and 300 to 400 meters. [16] The front sight is a post adjustable for elevation. The rear sight can be adjusted for windage. The sights can be adjusted with a bullet tip ...
The only major difference between the 601 and 602 is the switch from the original four grooves, right-hand 1:14-inch (1:355.6 mm or 64 calibers) rifling twist rate to the more common four grooves, right-hand 1:12-inch (1:304.8 mm or 54.8 calibers) twist. This was done as the original 1:14-inch twist rate to just stabilize the 55 grain bullet ...
ArmaLite AR-18: ArmaLite: 5.56×45mm United States: yes 1969-1985 ArmaLite AR-100: ArmaLite: 5.56×45mm United States: Armtech C30R: Armtech Ltd: 5.56×45mm (Quadrant with 3.56g standard M193 bullet, dimensions of the rectangular ammunition 35.7×15.8×9.5 mm) Australia: 1986 AS-44: 7.62×39mm Soviet Union: no 1944 AS Val: TsNIITochMash: 9× ...
The most common of these designs are the Hawk Industries Type 97, Norinco HP9-1 and M-98, the difference being that the HP9-1 has either a 12.5" or 14" barrel, whereas the M-98 has an 18.5" barrel and the Type 97 Military version uses magazines. [17]
A smaller version of the AR-10 and adopted by the United States military as the M16 rifle. Later developed by Colt into a popular semi-automatic Colt AR-15. AR-16: 7.62×51mm NATO: ArmaLite: Prototype battle rifle. ArmaLite AR-17: 12 gauge: Semiautomatic 12ga 2shot shotgun based on the earlier AR-9. AR-18: 5.56×45mm NATO