This single-stage non-adjustable drop-in trigger boasts a solid 4.5 lb. pull weight and is pre-assembled in a Hardcoat Anodized aluminum housing complete with rubber urethane feet for immediate competition hunting and tactical applications right out of the box. Carved from American A2 steel the Trigger Disconnect and Hammer are all Nitride Heat Treated to 70 Rockwell case hardness for ultimate strength and corrosion resistance. Includes custom-fit stainless steel KNS Precision Anti-Walk Pins for both standard AR and POF USA ambidextrous lower receivers. Just pull your rear take down pin out and two trigger pins. Remove your factory AR trigger parts and drop this complete system in and install pins. Within minutes your AR is operational again. NOTE: This curved trigger does not work with DPMS 308 lowers that have straight trigger guards or with Sig 716 lowers.