A game controller for controlling electronic games comprising: a controller chassis and an actuator system including: an actuator body; an actuator mechanism chassis; a detent chassis comprising at least one detent for arresting movement of the actuator body to create an end stop to limit the actuator movement; wherein the detent chassis is rotationally mounted within the actuator body such that the detent chassis can be rotated between at least a first position in which said at least one detent is in a stowed condition and at least a second position in which one of said at least one detent is in a deployed condition.