Wilson Combat Tactical Trigger Unit, Flat Face Trigger, Two-Stage, 3.5-4 Lb, Fits AR 9, Dry Film Lube Finish, Black TR-TTU-9MM-F 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.