No, I haven't ruined a barrel or even damaged a stock using copper remover, but I do try to be careful. Most of the copper removers like Sweets and Barnes contain ammonia so you want to take pains to get it all out before you put the rifle away. I've taken to using Kroil because of it's deep penetrating ability. It seems to neutralize any remainig amonia nicely. I protect the stock by placing a fairly thick rag over the stock right behind the action. Best wishes.
Cal - Montreal
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