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Airgun
Manual Ball Valve

These pictures were taken while I was waiting for the PVC cement to cure (2 hours!).

This is a side view. I decided to go with the standard design, where the air tank extends under the barrel, rather than having it stick out the back, and the gun being 6 feet long!
It's hard adapting 1 1/2" PVC into 3/4" copper.
Air intake is a one-way tire valve. There is nothing but a good fit holding it in, I'll have to see how it holds up.
Here's the spring I plan on using for throwing the valve very quickly. There's no trigger yet.
Valve is closed, gun is ready to be pressurized
Fire!