Step 1: The parts
The parts I used on this gun are pvc pipes (rated at least 400 PSI!)Including the pvc drain trap and all reducers/splicers.
All of the brass fittings need to be npt(national pipe thread)I used 3/4".
As for the stock and the barrel, the came off an old pump action bb gun, but those were just to make it cooler.
The trigger is a blow gun, and the laser sight is optional.
The most important part of this is the VORTEC BLOCK, which itself takes some time to make.
Step 2: Vortex block
The link below describes in detail how to construct a vortex block, its kind of like a powerball machine on crack.
Step 3: The gun
Cut all of your pvc out and dry fit before gluing together with pvc cement.
The butt of the gun is attached with a long bolt with rubber washers inside of the drain to prevent air leaks. And a bondo spacer to match the parts shapes together.
I attached the blow gun using plumbers tape.
I will be adding to the actual construction process soon!