Yankee Hill 9384 Low Profile Gas Block Clamp Screw .750" Black Phosphate Steel 0.95" Made in the USA, the YHM 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 mounted by the use of two clamping screws. The two screws take a 9/64" Allen Wrench.
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