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The revolutionary patented 'GL-Shock' absorbing Buttstock contains a recoil-reducing mechanism with a built in premium silicon chrome alloy spring creating a State-of-the-Art stock for your M4/M16.Advantages:Unique Patented “Anti-Rattle” MechanismSleek New Design with No Protruding Parts,Will Not Ge..

The revolutionary patented 'GL-Shock' absorbing Buttstock contains a recoil-reducing mechanism with a built in premium silicon chrome alloy spring creating a State-of-the-Art stock for your M4/M16.Adjustable Cheek Piece with Built-In Dual Picatinny Rails allows optimal Buttstock functionality &..