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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 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 AR-15 is nominally chambered in .223 Remington or 5.56×45mm NATO, with the .223 Wylde chamber allowing for the safe chambering of both, but many variants have been produced in different calibers such as .22 LR (sometimes referred to as an AR-22 [59]), 7.62×39mm, 9×19mm Parabellum, [60] 6.5mm Grendel, and shotgun calibers. [61]
AC-556: Sturm, Ruger & Co..223 Remington United States: yes 1999-2009 ACAR [6] Lithgow Arms Wedgetail Industries Thales Australia [7] 5.56×45mm NATO/.300 AAC Blackout Australia: 2023 Adcor A-556: Adcor Defense 5.56×45mm NATO United States: yes 2010-2020 ACR: Remington Arms Bushmaster: 5.56×45mm NATO 6.8mm Remington SPC United States: yes ...
.223 Remington.223 Winchester Super Short Magnum.224 Voboril.224 Boz.224 Weatherby Magnum.224 Valkyrie.225 Winchester.297/230 Morris.240 Apex.240 Weatherby Magnum.242 Rimless Nitro Express.243 Winchester.243 Winchester Super Short Magnum.244 H&H Magnum.244 Remington.246 Purdey.303/25.25 Remington.25-45 Sharps.25-21 Stevens.25-25 Stevens
Sterile ammunition provided to communist clients like the early Israeli state (c.1947–1948). Spurious headstamp dates are 4, 44, and 45 – making it look like they were made during the latter days of the German occupation (1939–1945). ZV Zbrojova Vlašim ("Vlašim Armory") (1945–1983) – Vlašim, Czechoslovakia.
.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 ...