[rwhichel]

Before you try to drill out the old busted off nipple drum, and risk messing up the original threads you might want to try removing it with an "Easy Out". The clean out hole in the busted off drum should serve as a good pilot hole for the appropriate drill bit for the "easy out". It will depend on how badly the old peice is rusted or coroded in. If the rest of the gun (bore etc.) is not rusted then the gun may have been cleaned properly after each firing and the piece may come out without much of a problem. Be careful however not to force the "easy out" to hard or you could possibly brake the "easy out" off in the busted off drum. Then you have a real problem. I have had a lot of luck with "easy outs", and never broken one off. You might want to give it a try. This is just a suggestion, good luck!