Montana X-treme gun grease is an extremely effective lubricant that works well at temperature ranging from (-50o to 600o F.). This anti-friction grease was developed specifically for the firearms industry. It deposits a fine protective and lubricating film on metal that will continue to function after the top layer of grease has extruded away. This grease is virtually unaffected by corrosive moisture and will not mitigate from hot surfaces. Also works great for weatherproofing metal.