Lucas Oil Products, Inc., Extreme Duty, Liquid, 8oz, Gun Oil, Plastic Lucas Extreme Duty Gun Oil is designed for semi-auto rifles, shotguns and pistols as well as full auto firearms and suppressors. It offers superior burn-off resistance. Its polymeric film protects metal from rust, moisture and dramatically reduces wear during all shooting conditions. Features: For High Volume, Full Auto, and Suppressed Fire Protects from Rust, Wear and Moisture Provides Maximum Heat Resistance