Was gifted a Stevens Model 330 (Thanks to Mad Dog for identifying) and it has a lacquer like black paint on part of the metal that houses the trigger, hammer etc. (Receiver ??) Guess previous owner wanted to cover up some rust or whatever. Wish to remove the paint, but do not know what solvent to use and best application method The metal has what appears to be a case hardened finish and do not want to damage the metal surface. Any recommendations would be greatly appreciated.