Heavy H&K USP (black) With locking slide. Fires 6mm airsoft plastic BBs or 6mm paintballs at over 230 feet per second. Accurate for 60 feet Special forces favorite - the USP. This model features a full-size removeable magazine. This is a spring gun, and the slide must be manually pulled back for each shot. The body is constructed of ABS plastic, with some metal internal parts.