I have been trying for 3 days now to get a lead build out of my 4 month old Berreta 9mm Cx4 Storm carbine. It is mostly located about a 1/4 of the way down the barrel. I let my son and his friends use the gun at the range and gave them 300 rnds of 115g. LRN to shoot. Well when he brought it back he negleted to clean it and it sat that way for about a month. I have tried Butches Bore and JB bore clean. I even let the JB soak in over night for 3 nights now. I am slowly winning the battle and getting most of it out. But does anyone know a better and faster way to get all the lead build up out? I did see on the JB instructions to try cleaning immediately after firing it so the barrel is still hot. Has anyone tried this and does it seem to work?