A game controller for controlling video games or other electronic interactive systems, having an adjustable trigger system for calibration or customized control of trigger action. The game controller includes a controller chassis and an actuator system, which includes a trigger body, a trigger mechanism chassis, a strike plate coupled to the trigger body, a first trigger adjustment control screw received in a screw thread disposed within the controller chassis, and a second trigger adjustment control screw received in a screw thread disposed within the controller chassis, wherein a portion of each of the first trigger adjustment control screw and second trigger adjustment control screw engages with a respective portion of the strike plate, and said portion of each of the first trigger adjustment control screw and second trigger adjustment control screw each create an end stop to limit the actuator movement of the trigger body.