The Shwarmajet: nerf rival PVC adapter trigger [version3] (no support)

an attachment to make a cheap nerf rival round accepting blaster that uses air power to shoot lots of balls with great innacuracy! requires  1 3 1 PVC couplers 2 1 1 PVC pipe at least 1 long but not more than 2 12 3 1 1 PVC pipe ...