Quote Originally Posted by mnbogboy2 View Post
Some of the older nuts have the remnants of threads showing all the way to the front. These have been relieved to clear the unthreaded shank. If the shank of the replacement barrel is a tad larger than the stock one they still interfere.

Randy
I think you've nailed it, threads interfer with the slightly larger "light Varmint" barrel.
I would love a dremel. But I've gotten good with files, angle grinder, etc. just haven't need one. It certainly would have been the best tool for the job many times over at this point ha ha. Someday...