Abstract: A water gun, having a trigger control, provides repeated discharge of metered volume stream of water, uses a sealed chamber containing a refillable reservoir of water pressurized by compressed air. The pressurized water supply is connected to a tubular housing, which transports the stream of water to a second end of the tubular housing to a nozzle assembly. A trigger controlled valve which is connected to a trigger mechanism, having an operator controlled trigger, initiating the flow of the stream. The initiated stream is volumetrically metered and terminated by a shuttle valve, which terminates flow upon reaching a valve seat which decelerates the velocity of the shuttle before it contacts the valve seat, which reduces stress on the seal. A method of sequential resetting is provided to reset the trigger valve, trigger mechanism and shuttle valve, enabling a repeated metered discharge.