Military Grade Bore Solvent removes leading, powder residue, and copper fouling from bore of firearm. Safe to use on metals. Will not cause rust, oxidation, staining, or galvanic corrosion. May be harmful to some paints, varnishes, and plastics. Keep product OFF of these types of surfaces unless a previous patch test has shown no effect. It is recommended that the firearm be re-treated with G96 Gun Treatment, G96 Gun Oil, or G96 Synthetic CLP Gun Oil after use.