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I advise not using ANY ammonia based cleaner, including Hoppes #9, on a nickel plated gun. The reason is the older type nickel is electroplated on with a copper undercladding. Ammonia cleaners, designed to remove the residue from copper bullet jackets, will dissolve the copper if it can get to it, leaving the nickel unsupported and peeling.
With normal firing, some nickel can affected by the muzzle blast or burning powder, leaving places where the copper can be reached by the ammonia, like the muzzle and front of the cylinders, but the ammonia can also reach the copper through any minute cracks in the nickel.
So, IMHO, it is better NOT to use any ammonia cleaner on any nickel plated gun, even for cleaning the bore.
Jim
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