Quote Originally Posted by Sentryduty View Post
Would it be possible to get a dremel rotary tool with a 90 degree attachment into the chamber? If so, I would start with a conical felt polishing bob and a compound, finishing with a polish, it should round the chamber lip very slowly without resorting to possibly ruinous bit based grinding.
That's just what I was thinking of doing, but haven't yet summoned up the courage. Your success with the Norinco is encouraging.