Attach this to your AR-15 with a threaded barrel...then use a blank round to "drive" a golf ball that would make Tiger Woods, John Daly or John Rambo proud! No more hooks or slices. It basically works like the military grenade launcher, but it's much more fun. Sturdy made of blued steel.Steel constructionThreaded 1/2x28 TPIPowered by blank rounds (not included)Measures 5.2" longWeighs 1 lb., 6 oz.