Killing Floor

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Operation Y

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KEVIN465M0RAN

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Tactical Assault Rifle Mod for Killing Floor

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The SR-556 / AR-556 is an AR-15 style semi-automatic rifle manufactured by U.S. firearms company Sturm, Ruger & Co. The rifle was introduced in 2009 in .223/5.56NATO and as a .308 AR-10 variant in 2013, the Ruger SR-762. It is one of several 21st-century AR-15 rifles to use gas piston operation