Abstract: An aiming device includes a laser housing attached to the trigger guard and adapted to fit snugly on the receiver assembly of a gas operated, slide actuated automatic weapon. The laser housing is provided with two vertically aligned parallel running compartments. The upper compartment contains the laser emission module while the lower compartment contains the power supply. The rear of each compartment is provided with a passage which opens to a slot in the rear of the housing to provide access for the electrical connection of the power supply, the laser emitter and an actuator switch which is carried in the slot. In this manner all electrical components for operating the aiming device are contained within the laser housing.The laser emission module consists of a laser diode and associated laser driver circuitry in a container configured to be received in the upper compartment of the laser housing. The emission end of the container is provided with one or more lenses for focusing the laser beam.