A high quality silicon carbide abrasive paste that is used for lapping the bore of a firearm the bolt face bolt lugs and a hundred other uses where a perfect final fit or a lapped smooth surface is needed. When lapping a bore pressure will likely increase with grit impregnated bullets. Due to the likely increase of pressure light loads are recommended. Five shot strings up to a maximum of twenty shots of each grit are recommended. Repeating the process using progressively finer grits will produce a significantly smoother bore.