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YHM-9387 Bull Barrel Gas Block .936 Diameter AR15 AR-15 Low Profile This gas block replaces your existing front sight and provides a simple, low profile gas block to your bull barrel. It clamps to the barrel using 3 Allen screws. This gas block has a bore diameter of .936 inches for bull barrels. Manufactured from aluminum and finished with a matte black anodize. Made in the U.S.A.
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