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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I have noticed that a golf ball fits perfectly in 1.5" EMT conduit from the electrical section of a hardware store. You can use an EMT Compression fitting to get 1.5" male pipe threads. EMT conduit has been proven very reliable and can even be used on a hybrid cannon as a barrel.