RE: stuck choke tube
dont use a torch on your barrel ,even if you dont get it to hot it will ruin the blueing, use a electric heat gun or just a hair dryer. if it doesnt come out after that ,take it toa gun smith ,it might pull the threads out if you get it to hot, and the end of the barrel is so thin it wont take much heatthe scratches you see may be small cracks if the tube split you may have to have the barrel cut off and new chokes but if you arent a gun smith and it doesnt come out easy leave it to a professional .and if it does come out. make sure that when you put another one in that its not to loose .