I'll try a drill bit in the plug and see what happens. The breech plug had a very thick coating of a vaseline looking grease when I started. The bore had a thin layer of grease or oil in it but nothing major. I did run JB's in the bore. I started with a thick oiled patch and JB's for 75 strokes. Still not seeing much improvement I doubled the patch for as tight as I could muscle down the bore and that didn't help. I moved on to a JB/oil patch around a brass brush for another 25 strokes, then the same thing in more of a scrubbing motion and the bore is still uneven not that great. Certainly not something I'm willing to keep for what I paid for it. If it was a hundred dollar gun I would be more ok with it. It's certainly not a shiney smooth finish I would expect.