Show us your pneumatic spud gun! Discuss pneumatic (compressed gas) powered potato guns and related accessories. Valve types, actuation, pipe, materials, fittings, compressors, safety, gas choices, and more.
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MCRKilljoy
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Sat Dec 10, 2016 10:04 pm
I built this air gun out of steel pipe. The tank is 1 inch steel pipe, the barrel (not shown) is 1/2 inch copper pipe or 1/2" SCH 80 PVC pipe. The ball valve is the pilot, and you fill with the quick disconnect. I also made a brass adapter to use a bike pump instead of an air compressor. Barrels are interchangeable and I have a 1/2 inch PVC plug as a dust cap when no barrel is installed. Barrels are just screwed in hand tight. This air gun is very loud and makes a big bang when it goes off. Ammo is AA batteries and 1/2 inch dowel sections. I also have a custom machined brass projectile. Corks are also a good option, and corks can be supersonic. In the first picture you can see a brass street elbow, it was later replaced with a galvanized one as you can see in the second picture.
![Image](https://cdn.instructables.com/ORIG/FMV/TGGX/IWQV747X/FMVTGGXIWQV747X.jpg)
Last edited by
MCRKilljoy on Sun Dec 18, 2016 2:09 pm, edited 5 times in total.
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auxiliary
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Tue Dec 13, 2016 8:18 pm
I like the ergonomics so you can hold the tank with one hand and use the elbow as a pistol grip and the ball valve handle as a trigger. Did you try out different pilot valves? It seems like you could get away with a smaller valve than a 1/2" ball valve.
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MCRKilljoy
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Wed Dec 14, 2016 6:21 pm
Auxiliary, I used the 1/2" ball valve because I had it lying around. I hold the tank with one hand and pull the valve with the other. The elbow does not make a good pistol grip. The top port of the QEV is where you hook up the barrel. At 150 PSI I shot an AA battery through thick plywood using the 1/2" copper barrel.