The Timney AR PCC Two Stage Trigger is the ideal drop-in solution for enhancing your AR pistol caliber carbine. The trigger pull is set to 2 pounds for both the first and second stage. The trigger makes use of your firearm's original hammer/trigger pin as well as the safety. Timney Triggers Timney AR PCC 2 Stage, Straight 2+2lb Pistol Caliber Carbine Fits All Calibers In Pcc (.40, .45, 9mm) Trigger 682