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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 SR-556 is a semi-automatic AR-15 style rifle manufactured by Sturm, Ruger & Co. The rifle was introduced in 2009 in .223 Remington/5.56×45mm NATO and as a .308 Winchester AR-10 variant in 2013, the SR-762. [4] It is one of several AR-15 rifles to use a gas piston operation.
The Ruger AR-556 is a semiautomatic AR-15 style rifle manufactured by U.S. firearms company Sturm, Ruger & Co. Introduced in 2014 as an entry-level AR-15 using a direct impingement action, with variants since being released such as the upgraded AR-556 MPR (multi-purpose rifle) in 2017 [1] and the AR-556 pistol in 2019.
AR-15 Lightweight A2 Short Ribbed S-1 A2 Yes Yes .223 REM 5.56 NATO 16 in. A1 1:7 Yes A2 AR6551 AR-15 Target Model A2 Ribbed S-1 A2 Yes Yes .223 REM 5.56 NATO 20 in. A2 1:7 Yes A2 AR6601 AR-15 Match HBAR A2 Ribbed S-1 A2 Yes Yes .223 REM 5.56 NATO 20 in. HBAR 1:7 Yes A2 AR6700 AR-15 Competition HBAR A2 Ribbed S-1 Flattop Yes Yes .223 REM 5.56 NATO
The company manufactures AR-15 style rifles chambered in .223 Remington/5.56×45mm NATO and AR-10 style rifles chambered in .308 Winchester and .260 Remington, among others. The company attracted attention within the firearms industry with its version of the AR-10, the Panther LR-308, earning Shooting Illustrated 's 2005 Golden Bullseye Award ...
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 or pointed tool. The AR-15 can also mount a scope on the carrying handle.
The M4, and its variants, is a lightweight 5.56×45mm NATO (and .223 Remington) caliber, gas-operated, magazine-fed, air-cooled selective fire AR-15-pattern firearm. Its gas operation consists of an internal piston (often incorrectly referred to as direct impingement ), [ 56 ] a rotating bolt, and bolt carrier that reciprocates into a receiver ...