Bowden Tactical J1311534 Low-Profile Adjustable Gas Block Made Of 4140 Steel With Black Nitride Finish & .750 Diameter For AR-15

Super low-profile .750 diameter gas block, set screw style, black nitride. American made from American sourced 4140 pre-heat treated steel.8-32 adjustment screw from muzzle end. 4-40 locking set screw..750 diameter set screw style. If your barrel is not pre-dimpled, it is recommended that you use a gas block alignment tool.