Mild abrasive gently polishes the bore clean, but leaves embedded copper in the steel’s micro fractures as recommended by top barrel makers. Proper use leaves your prized bore even smoother than before and eliminates the need for “fouling shots.” All KG liquids include a convenient twist-open, pinpoint applicator spout with snap-top cap to help prevent spills and conserve product. SPECS: Liquid, 4 fl. oz. (118ml).