This gas block replaces your existing front sight to provide a simple low profile design that can be used to mount a rifle length forearm to a carbine length barrel. It is Hinged to go around the barrel with a pinned and welded muzzle device. The two screws take a 9/64 Allen Wrench - Specifications - Low Profile - .750 Bore Diameter - Clamp Screw Mounted - Weight: 1.98 Oz
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