The P99DAO model is similar to the previously released P990 Double Action Only variant. The internal firing pin is at rest without pre-cocking. The trigger travel is approximately 14 mm (0.55 in) and the trigger pull is approximately 38 N (8.5 lbf). The trigger mechanism has a constant length and force from the first to the last shot, and the firing pin returns to the uncocked position after each shot.