When shooting IPSC one of the targets that was routinly used was something called a dragon's tooth, it was a small trianglar chunk of hardened steel about six inches high and 3 inches wide.....you would hit it with a 5.56 or 7.62round at least 50 yards away and it would give a satisfying ring. I've been looking for a place to buy these on-line and but can't find a source.....anyone point me in the right direction.