Gun Butter's Trigger and Locking Lug Grease Gun Butters Trigger and Locking Lug Grease is a new technology reducing the moment of inertia in moving parts and protection of high impact surfaces. It will out perform conventional graphite and molly greases and offers many times the adhesion. Trigger Butter was used exclusively for years in competition by our team. Now blessed by our professional shooters, Gun Butters Trigger and Locking Lug Grease, is now available for the first time to all shooters of any level concerned with protection and performance.