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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.
.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]
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.
Pre-chambered "Drop-In Ready" barrels can be purchased, and the correct headspace is set using a proprietary barrel nut design. The barrel is threaded to fit the Ruger action threads. This way, a competent gunsmith only needs an AR-15 barrel wrench and proper headspace gauges to fit a new barrel. [14]
For accuracy and longevity, the cold hammer-forged 41V45 chromemoly vanadium steel barrel has been precision-rifled and chrome-lined. Barrel is fluted for reduced weight and improved barrel-cooling and features an SR-556/Mini-14-style flash suppressor mounted with a 5/8"-24 thread.
It is the first model of the Ruger SR-series. The full-size Ruger SR9 is chambered in 9×19mm Parabellum, and it is shipped with two 17-round, flush-fit magazines and a loading tool. An economy version of the SR9, the 9E, was released in 2014. The Ruger SR9c started to ship in January 2010, according to Ruger. [12]
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Kelley later purchased four guns, including a 9mm Glock 19 pistol, a .22-caliber Ruger SR22 pistol, a Ruger GP100.357 Magnum revolver and a Ruger AR-556 rifle, at stores in Colorado and Texas between 2014 and 2017. [65] On October 29, a week before the shooting, he posted a photo of what appeared to be a Ruger model AR-556 rifle on his Facebook ...