Shooter's Choice MC-10 Full Auto Grease Precision Applicator Brush - The Otis MC-10 Full Auto Grease Precision Applicator Brush delivers the ultimate friction protection for actions, triggers, and slides. MC-10 is a high-performance synthetic firearm grease that will not freeze, burn, or carbonize in extreme temperatures. Simply click the yellow precision push button and apply to high friction areas of your firearm. Size: 3ml