Do your firearm a favor after punishing high-round shooting apply Hoppes Black Precision Oil lubricant to ensure reliability in extreme hot and cold conditions. The synthetic polymer formula includes rust inhibitors and has an effective temperature range from -65F to 540F. Precision tip applicator easily directs flow into small areas. 4-oz. bottle. Cancer and Reproductive Harm- www.P65Warnings.ca.gov. Type: Lubes.