WGP made 50cal and 62 cal Snipers. The 62cal snipers were built with a barrel having a bore extension on the back of the barrel and a bolt that was turned down in the front. Each barrel was unique to the gun it was made for, as they were made from body's, whos feedneck opening was slightly out of place due to a manufacturing error. The story we were (By Budd) told was that the machine kept slipping out of spec on each body, moving the feed neck slightly forward with each body. So each barrel was screwed into the body and the feed hole was drilled for that specific body. Budd did say that 62 and 50 cal was fun because you could shoot through small holes in brush or cover. At that time you could shoot .62 cal at like 310 or 320 FPS, and a little higher for .50 to make up for velocity loss of the smaller lighter ball.