A trick I learned from a pawn broker long ago, use a carpenters pencil. Scrub the lead (graphite) all over the minor rust spot (wont take off any bluing, but it will remove light surface rust) then buff with a clean dry rag. This has served me well thru the years on second hand weapons. The pits wont go away but it will look much more presentable. Also on a blued firearm, with a wood stock, I always clean and leave a light film of Old English furniture polish with scratch cover, they make it in light and dark. It won't make scratches go away but it will make them look more natural. Work it in good on any checkering. I do this on the blued parts as well.