Jeese! If you want the blued "look", strip all the paint off the metal parts and take it to a gun smith for rebluing. You could try "cold bluing" using something like a Birchwood bluing kit, but I doubt you's be happy with the results.As for the wood, takes only elbow grease, paint stripper and time to remove all the paint. Then refniish. Probably could get by with some sanding out the dents and scratches,and then "restain" followed by several coats of satin or flat finish polyurethane.Coule leave it natural and rubb down with boiled linseed oil.

If the butt plate or other exterior parts are a "plastic" and have been painted too, it'll be tough to get the paint off these without buggering up the look. I suggest pitching these parts and ordering new ones.