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Yankee Hill AR-15 Railed Bull Barrel Gas Block .936" YHM-9388
This gas block replaces your existing front sight and provides a picatinny rail on the same plane as your flat top AR receiver. 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.