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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 AR-15/M16 can easily be converted to the 6×45mm with a simple barrel swap with few or no further modifications to the rifle. This is also true for rifles such as Ruger's Mini-14 and most bolt-action rifles chambered for the .223 Remington cartridge. [1]
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 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.
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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).
Close-up of L85A2 with Magpul Industries EMAG polymer magazine with clear viewing window. The STANAG magazine, while relatively compact compared to other types of 5.56×45mm NATO box magazines, has often been criticized for a perceived lack of durability and a tendency to malfunction unless treated with a level of care that may not be practical under combat conditions.