The Rise Armament RA-140 Super Sporting is a single-stage, drop-in AR trigger with a flat blade and a fixed pull of about 3.5 lb. This version is engraved with the "Don't Tread On Me" motif. Features: Single-stage drop-in design with no set screws Flat trigger blade Approximately 3.5 lb fixed pull Clean break and short reset Nitride-coated S7 tool-steel internals in an aluminum housing Anti-walk pins included Fits AR-15 and AR-10 mil-spec lowers.