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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 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 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 .223 Remington (designated 223 Remington by SAAMI [4] and 223 Rem. by the C.I.P. [5]) is a rimless, bottlenecked, centerfire intermediate cartridge.It was developed in 1957 by Remington Arms and Fairchild Industries for the U.S. Continental Army Command of the United States Army as part of a project to create a small-caliber, high-velocity firearm.
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]
Ruger AR-556: Sturm, Ruger & Co. 5.56×45mm NATO/.223 Remington.300 AAC Blackout 6.8mm Remington SPC.308 Winchester/7.62×51mm NATO (SR-762 only) United States 2009 Ruger XGI: Sturm, Ruger & Co..308 Winchester.243 Winchester United States Saiga semi-automatic rifle: Kalashnikov Concern: 7.62×39mm Russia 1990s Kalashnikov SR-1: Kalashnikov Concern
The rifle model is based on the Colt AR-15. Smith & Wesson offers the M&P15 semi-automatic rifles in different configurations, tailored to specific shooting applications and styles. The rifle has different models that come chambered in 5.56mm NATO/.223 Remington, .22 Long Rifle, and 5.45×39mm.
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 ...