Mountain Gunner
TNHagies covered it as best i could... Sure do wish he and/or I knew why we do not get the UC 'crud ring' but i still think it is related to what oils that you use in the bore. It would be my suggestion not to use an oil with Teflon in it, and DO use a synthetic oil of some sort. I use Montana X-treme Bore Conditioner and/or Slip 2000 - you can run a search on both products and find the information....