I have used Brownells room temperature nickel stripper with good results. It works better when gently heated. It can be difficult to determine when all the nickel is removed. It leaves the metal with an uneven patina that requires polishing and refinishing. I have also had a metal plating company strip the nickel. The end result was better than with Brownells. The professional strip cost $25.00 for a disassembled handgun. Brownells stripper is about $60 and will strip about 2-3 handguns.