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When barrels are blued they are blued on the inside as well as the outside ,when you look through the barrel you cant see it but it is there . I have sectioned Rem mod 7 barrels off police training rifles that have fired 23000+ rounds which still had blue in the non driving corner of the rifling . This is what is staining your patch
Are you sure? It is a corrosive process and you normally plug the barrel to stop rusting in the bore
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