Military Approved Bore Solvent MIL-PRF-372F Type A. 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 any G96 Gun Oil after use. This product is for use in cleaning caliber military weapons, operating in the temperature range of -45°C to +43°C (-49°F to +110°F).