Used and recommended by major firearms manufacturers 4oz Gun Metal Polish & Tumbler Media Alternative 4oz Bore Solvent & Ultrasonic Gun Cleaner MADE IN USA Lucas Gun Metal Polish & Tumbler Media Additive cleans and polishes factory firearm finishes like blue, nickel, stainless, aluminum and brass. Not for use on cold bluing. Lucas Extreme Duty Bore Solvent & Ultrasonic Gun Cleaner is a premium blend of cleaning solvents and corrosion inhibitors