Quick view CUSTOM UNDERHAMMER TRAP BLACKPOWDER - C31313 12 Gauge; 99% blue, very good+ bore, excellent stock, 36'' barrel, This is a custom-built Trap Gun, one of three built in the 1970s. Built by Gary McGraw former N.M.L.R.A. Range Officer. It has a modified choke and a LOP of 15 inches. The front sight is... $495.00 $445.00 Compare