I was at a pawn shop and they had a Ruger .44Magnum that looks mechanically sound. Comes with a red dot scope. They knocked the price down by $100 but I still didn't buy it. The reason is unsightly scratches with rust in the scratches all over the barrel. It was like somebody kept tossing the gun into a metal toolbox or something. The barrel looked OK but I'd have to check it with a bore light to be sure. My question is whether the stainless scratches with rust are repairable? The scratches run from minor to moderate but no deep ones. Any ideas?