Umbrella Corporation AeroShell 33MS / 64 Grease - 2 Pack High adhesion, superior bond strength lubrication / Great lube for firearms, hinges, reels, ball bearings, bicycle gears, even telescope mounts Long lasting for building, hot days, storage / Two .5oz jars AR lubricant Aeroshell 64 / 33 MS is exceptional for anti-corrosion and anti-wear Mil-spec grease (MIL-G-21164D) for upper receiver threads, barrel nut installation and buffer tube / receiver extension installation Made to perform under extreme pressure and heat to prevent damage