The NcSTAR AR15 Golf Ball Launcher attaches to the muzzle of an AR-15/M4/M16 and launches golf balls with 5.56 blanks. It screws onto the end of the barrel threads. DO NOT use live ammo. It is capable of launching golf balls to several hundred yards (400+ yards). It has a steel construction and the thread pitch is a 1/2 x 28 RH thread (AR barrel thread pitch). The golf ball launcher is 5.3 inches in length and weighs 18.1 ounces.