I have a Francotte Eagle Grade 12 (2 5/8" chambers) which has -in both barrels- a ring of rust or pitting? at what appears to be the juncture of chamber and breech. I can't guess how deep-but both the dealer from whom I bought the gun and the dealer to whom I have consigned it- didn't and don't mention it in their online ad's. I am ashamed to say that dsid not notice this when I first examined- to buy the gun. I have not tried cleaning this area with a bronze brush but all the above comments encourage me to do so. I would be grateful to see what u-all think. Thanks. pheasantfisher