Gold plate must be plated over nickel, tin, silver and some other metals. To plate over steel, it must be nickel plated first (like chrome). So, the plating underneath is likely nickel. Caswell makes some gold, silver, nickel and copper plating kits that can be used to fix plating blemishes. A simple battery charger and electrolyte can be used to remove the gold plate that is on the gun...or restore it.
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Guy
SWHF #474 SWCA LM#2629
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