Patent ID: 8875435

Claim:
An actuator for setting at least one optical property of an aiming device for a barrel, comprising: a coupling part rotatable about an axis of rotation; a dial fitted on said coupling part and having a set of markings collectively forming a scale relating to a set of distances from the aiming device for the barrel, each of said markings representing a position of a crosshair of the aiming device corresponding to at least one of a particular distance and ammunition for the barrel, said dial comprising a plurality of ring-shaped index elements each having a respective one of said markings; a guiding device for allowing engagement of said coupling part with said dial in a non-rotatable manner, said guiding device comprising longitudinal serrations on said coupling part and on each of said ring-shaped index elements, said longitudinal serrations being configured to allow non-rotatable stacking and engagement of said ring-shaped index elements on said coupling part in any of a plurality of equally spaced angular positions relative to said coupling part so as to form said scale; and a transmission device including: a stationary base portion to be mounted to the barrel; and an adjustment disk mounted on said stationary base portion so as to be rotatable relative to said stationary base portion, said coupling part being detachably mounted on said adjustment disk so as to be non-rotatable relative to said adjustment disk.