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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 cases tend to have similar case capacity when measured, with variations chiefly due to brand, not 5.56 vs .223 designation. The result of this is that there is no such thing as "5.56 brass" or ".223 brass", the differences in the cartridges lie in pressure ratings and in chamber leade length, not in the shape or thickness of the brass. [59 ...
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.
The official name for .223 Remington in the US Army is cartridge 5.56x45mm ball, M193. If a 5.56×45mm NATO cartridge is loaded into a chamber intended to use .223 Remington, the bullet will be in contact with the rifling and the forcing cone is very tight. This generates a much higher pressure than .223 Remington chambers are designed for. [3]
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 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]
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.223 REM 20 in. HBAR 1:12 Yes Type 2 Duckbill 606A CAR-15 Heavy Assault Rifle M1: A1 Triangular S-1-F A1 Yes No .223 REM 20 in. HBAR 1:12 Yes Type 2 Duckbill 606B CAR-15 Heavy Assault Rifle M1: A1 Triangular S-F-1-3 A1 Yes No .223 REM 20 in. HBAR 1:12 Yes Type 2 Duckbill 607: CAR-15 SMG: 1st Generation Short Triangular S-1-F A1 No No .223 REM ...