I've got KG12, it never touched copper fouling in my barrel. Initially, when cleaning with the KG, I thought I had a barrel that wasn't going to be a "copper mine" for a change. On a whim, I tried some "Wipe out" Tactical Advantage and, boy, did the patches start coming out dark blue, almost black. I see my accuracy start to fall off after 15 rounds and know it's time to get out the Tactical Advantage.
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