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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 and as a .308 AR-10 variant, the Ruger SR-762. It is one of several 21st-century AR-15 rifles to use gas piston operation (SR-556). In January 2016 Ruger discontinued all SR-556 rifles and introduced a new takedown variant with a lightweight KeyMod handguard.

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