The Wilson Combat TR-TTU Two Stage 9mm Flat trigger, a product of advanced engineering and design, boasts an impressive pull weight ranging between 3.5 - 4 lbs. This optimal pull weight is achieved straight out of the box, eliminating the need for any user adjustments or modifications.Features :Drop InTwo stageNo adjustment screwsCNC precision machinedH13 steel and treated with a dry film lube finishPositive trigger reset3.5 - 4 lb trigger pullSpecifically designed for the WC AR9 Carbine