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. In addition, we have found nothing superior to Ultima-Lube II for the proper lubrication and protection of the hand-fit custom firearms that Wilson Combat is known for. Ideal for heavy wear areas. Stays put under extreme conditions, 40Adeg to 350Adeg F temperature range. Recommended Uses: Full and Semi-Auto rifles and carbines, Optimal in AR style rifles at temperatures above 50Adeg F. Ultima-Lube II Grease: Ideal for heavy areas Stays put under extreme conditions 40Adeg to 350Adeg F temperature range Recommended for full and semi-auto carbines, optimal in AR rifles as well