In regards to the hammer not cocking with a barrel on the frame, I have honed the locking bolts, no help. I talked to gunsmith and he told me to barely open the barrel from the frame and see if it would cock and it did cock, and I can close the barrel, pull the trigger, and the hammer will hit the firing pin. The gunsmith wants me to send it to him, but I'm thinking that one of you Contender guru's can now tell me what I need to do to fix the problem. By the way , the locking bolts on barrel are the type with the tit that sticks out.