The United Armory .750" low profile gas block can be used if one is trying to mount a standard free float tube or four rail hand guard on a carbine or mid length gas system. This will fit in any free float tube with internal diameter of 1.75 (which should be most free float tubes). Machined to Mil-spec from 4140 steel. Black Phosphate Finish. --- Includes Set Screws, Roll Pin & 6"x5" BIYAR15 Window Decal.
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