Easy to install, non-adjustable, AR-15 trigger replaces the heavy, gritty-feeling, factory hammer and trigger for a smooth, clean-breaking pull that?s sure to improve accuracy. Unique, single-stage design positions the sear engagement point behind the hammer for added leverage and a dependable, 3-pound pull weight. High-performance, low mass hammer reduces lock time. Precision-cut engagement surfaces are heat-treated for low wear. Requires gunsmith fitting in receivers with a sear block.