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I have a couple of pneumatic spud cannons. My buddy and I built nearly identical models, except that he used a large ball valve and I used a solinoid (sprinkler) valve. Same size tank, switchback piping, and barrel. Mine cost about $20 more, but it outshoots it by 25-100% with identical pressure and projectiles.
We've never been able to build a pvc or abs combustion model that can compete with the pneumatic ones.
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