The Doublestar Superlite Same Plane Gas Block has a 1913 picatinny rail that matches the height of a standard Mil-Spec flattop upper receiver allowing the use of same-plane flip up front sight. Made from 6061 T6 aircraft aluminum and Type III hard coat anodized. The Superlite Gas Block weighs just 2.4 oz. and features 5 set screws to ensure a secure fit to your barrel. Fits barrels with a .750" gas seat.