The Timney AR PRO Two Stage AR-15 / AR-10 Trigger is a self-contained, drop-in trigger upgrade compatible with mil-spec lower receivers. This two stage trigger boasts an 8-oz. first-state pull weight and a 1.5-lb. second-stage pull weight for a consistent and crisp pull every time. Perfect for the harshest conditions or dominating the competition, this trigger upgrade is built to last.