JARD inc. - AR-15 Non-Adjustable Trigger KitEasy to install, non adjustable, AR 15 trigger replaces the heavy, gritty feeling, factory hammer and trigger for a smooth, clean breaking pull thats 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