I picked up a used Berreta Stampede "Deluxe" which has a painted on color case hardened finish on the frame. The prior owner got some ammonia based bore cleaner on the frame which removed some of the painted on finish. The frame under the painted on finish is a brown/gold color. At this point, would the best option be to remove the rest of the painted on color case finish? After that should I put a clear coat over the frame or just keep it oiled?