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Hoppe's and other ammonia type cleaners will not harm or discolor nickel itself, BUT, the older type nickel plating requires a copper undercladding, since nickel will not plate directly onto steel. If a chip, crack, scratch, or unplated area allows the ammonia cleaner to get to the copper, it will attack the copper underneath the nickel and the nickel will peel off. To be safe, avoid use of such cleaners on nickel plated guns.
Jim
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