Wilson Combat Ultima-Lube II is a blend of petroleum and synthetic lubricants specially formulated to insure optimal performance of any firearm and inhibit wear. The unique blend of lubricating fluids has proven ideal for today's high-tech semi-auto weapons, whether manufactured of conventional steels, aluminum alloys or stainless steel. The Ultima-Lube II Oil is ideal for heavy wear areas. It stays put under extreme conditions, 40° to 350° F temperature range. This means it is great for service pistols/revolvers and broken-in custom handguns, Long guns of all action types, and AR style rifles in 20 to 50 Degrees Fahrenheit.