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I Use Montana Extreme solvents. They have a copper killer 50 BMG formula, which I used for the Mosin's deep cleaning, I also use there regular bore solvent when I'm just cleaning up a little carbon fouling after a shoot. Once in a while I'll also use Mpro 7 for carbon fouling if I have to clean indoors, the Monana stuff has strong fumes. But I really like there copper killer formula for copper fouling, it's safe to leave in the barrel, wont harm your metal.
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