Ping pong ball gun

This is a model of a ping pong ball gun that I designed using Fusion 360. It is powered by air, which is held in the air tank at the rear of the gun. The air tank can be filled with a bicycle pump or an air compressor. Air is released out of the tank through the solenoid valve which is powered by two 9-volt batteries. if you are interested in building this design, supplies are listed below.(I have not actually built this yet, if I am missing something, please let me know)

- 2 9-volt batteries