Nickel plating with visible corrosion is a nightmare underneath the plating. Nickel plating with a few light pits and wear can be re-nickeled. I ran into a major problem trying to re-nickel plate a 1st Model M&P in 32-20. The refinisher "thought" he could do it, first you have to remove the old nickel through electrolysis, clean up the surface of any corrosion, then re plate. Problem arises when they strip the old nickel and reveal the "nightmare" underneath, even with some surface pits that don't seem to be a problem there can be serious corrosion under the plating. I wouldn't again attempt to refinish a nickel plated firearm unless it was only visible wear I was refinishing, no pits....in hindsight I should have left it alone, it wasn't all that bad.