I really would love to see some one build a propane powered golf ball shooter, semi-auto, self loading......U can do it, maybe tennis balls for safety, but golf balls would be wicked. Oh yea, Use Black pipe rather than pvc, for the golf ball machine gun.
Dave, Use caution with using propane, I have built TONS of spudguns and had one explode in my hands.
The way I found that saved my life possibly that day was I had the chamber wrapped with rope. I had selected a cheap cloth rope from Home Depot but it did keep the shrapnel away from my gut.
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