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Old January 22, 2013, 06:49 PM   #8
Unclenick
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Join Date: March 4, 2005
Location: Ohio
Posts: 10,226
Could just be copper build-up. Most gun cleaners claim to remove copper, even when they don't do it very well. Ballistol could loosen the edges of the layers in a serious build up, so that it feels rougher on a patch. Read this article as a starting point.
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