Well, after 7 years of no problems took them out last year and all 3 of the guns wouldn't even hit paper at 25 yards. I couldn't figure out what happened. Perhaps the bores got corroded somehow? Is there a way to fix to clean these barrels out 100% and try again or are the barrels most likely ruined? What happened? They are all Thompson Bone Collectors that I got at a sale price so probably not worth buying a new barrel for.