I mostly use CLP, unless I'm breaking in a rifle barrel. or I buy a gun with a lot of copper fouling. In which case I use an old bottle of 7.62 copper cleaner. Lots of ammonia so do it in a well ventilated area. I wouldn't use Hoppes or any other solvent on a nickel gun though. Would not want to risk damage to the finish.

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Even older, even crankier....