Your best bet is 4 ought (oooo)steel wool and WD40.Saturate the SW with the WD40. Very lightly rub the rusted area. Yes some of the blue will come off.Don't use any of the rust remover products. It will take the blue right off since Bluing is a rusting process.If it's heavy rust you'll probably have pitting.Surface rust will clean up fairly well.Once you have the rust removed wipe the gun down with RIG or other rust preventive. Rebluing has gotten very expensive.Usually not worth the money. Use the gun and don't worry about a little missing bluing or surface rust.

Ruger Redhawk