Water gun

A water gun comprising:

• a casing that imitates a gun barrel;
• a rear grip portion that is formed at a rear end or close to the rear end of the casing;
• a front grip portion that is formed on a front half portion of the casing;
• a muzzle portion that is disposed at a front end of the casing;
• a pump mechanism in the front half portion of the casing which includes a first cylinder and a second cylinder that are oriented in opposite directions in a front-to-rear direction;
• pumping tubing that forms a pumping path through which water is pumped up from a water storage tank by the pump mechanism;
• wherein, the casing being configured so that a rear half portion is made slidable relative to the front half portion together with the rear grip portion, and
• wherein, the pump mechanism comprising:
• a first piston that is disposed so as to move forwards and backwards within the first cylinder and a second piston that is disposed so as to move forwards and backwards within the second cylinder;
• an interlocking member that is coupled to the first piston and the second piston and which is brought into engagement with the rear half portion of the casing;
• pumping check valves that can close respective openings in the cylinders that establish a communication between the cylinders and the pumping tubing;
• a jet water flowing chamber that is disposed in front of the first cylinder and which has a discharging check valve that can close an opening in a water supply port from the first cylinder so as to allow water to jet from a muzzle of the muzzle portion;
• and
• a water supply path that connects the second cylinder with the jet water flowing chamber and which has a discharging check valve that can close a water supply port in the second cylinder.