DIY Large 4 Inch Bore Vacuum Cannon

No fuel, just the atmosphere:

Very interesting! It really does some damage on the watermelon at the end.

3:26 – Lucky he followed Jeff Cooper’s four rules of Large Bore Vacuum Cannon safety.

Thoughts? Is the ATF going to ban the Atmosphere? You get your $5000 atmosphere stamp bro? he he I got jokes.

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