Mizumi Ken-Sword Watergun This MIZUMI Ken-Sword is a new generation of watergun! This revolutionary new design is the only sword in the world which has an included water-gun! Ken means water-sword, and this is the only one that includes a water-gun too! The tank volume for the Ken is 1.1 liters, and it shoots about 10 meters. Tons of fun at the park, pool or beach!