This is my first instructable so feel free to leave comments and tips.
Step 1: Materials
4 1/2" PVC 90 degree joints
1 1/2" PVC coupling
1 1/2" PVC ball valve
(I think you have discovered by now that all the PVC components are 1/2".)
1 PVC tee
1 PVC one-way valve (Look for it under the name "check valve")
1 PVC end cap
Assorted lengths of PVC pipe (1/2", of course)
Dowel that will fit into the pipe
Step 2: Assemble the Stock
(The stock also doubles as an air tank.)
Step 3: Assemble the Barrel
Again, don't cement the pieces together! (I made that mistake.)
Note: I attached a short bit of wood to my ball valve to make it easier to turn. That is what the long wood thing is in the picture.