YHM Specter Gas Block Assembly

Allows the user to mount forearms that extend beyond the standard gas return system, provided the inside diameter of the forearm is 1.625 inches or greater. Allows mounting of forearms without the removal of your pinned or welded muzzle accessory. Consists of a simple, durable two-piece design. Mounted by four socket head cap screws uing a 7/64 inch Allen wrench. Made from high quality steel and fnished with mil-spec phosphate coating.