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The major dimensional difference between the chambers that fire the .223 Remington and the 5.56×45mm NATO is the longer and larger-diameter "freebore" [3] in the 5.56 chamber (0.0566 in (1.44 mm) vs 0.0250 in (0.64 mm) length, 0.2265 in (5.75 mm) vs 0.2240 in (5.69 mm) diameter). Freebore is a short and smooth section of the barrel that is ...
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 rifle's caliber is .223 Remington/5.56×45mm NATO, and the barrel is hard chrome lined in both the bore and chamber. Unlike the current Colt M4 Carbine which features a four-position telescopic stock, the Bushmaster has a six-position stock.
.223 Remington – Original AR-15 cartridge: .223 cartridges may function in a 5.56×45mm rifle, however 5.56×45mm cartridges may produce excessive pressure in a .223 Rem rifle. On the other hand, a .223 Wylde chamber is used on .223 Rem rifle barrels to allow them to safely fire either .223 Remington or 5.56×45mm NATO ammunition. [6]
Firing a 5.56×45mm NATO round out of a rifle chambered in .223 Remington could be injurious or fatal to the user as well as the gun, however .223 Remington ammunition can be fired safely from almost any rifle chambered in 5.56×45mm NATO as the NATO specified rifles can handle much higher chamber pressures than the .223 Remington is capable of ...
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 ...
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In early 2018, Ruger introduced variant models for the 5.56 NATO/.223 Rem (# 26965) and .300 Blackout (# 26968) that accept STANAG magazines. Hunter : a heavy barrel version bedded into the Magpul "Hunter American" stock using AICS-pattern PMAG® 7.62 AC box magazines , with a 20 inches (510 mm) threaded alloy steel barrel factory-equipped with ...