a spud gun comes in tow varieties. one is called a pneumatic and the other is some other thing.
pneumatic spud guns have a barrel, a valve and a tank. The tank is filled with compressed air and then, after inserting the potato, the valve is opened, sending the spud flying.
The other kind. People that end up blowing themselves up is a barrel directly hooked to a tank with no valve. Some combustible substance is put in the tank (hairspray) and ignited, creating an explosion, pushing the potato out of the barrel
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