SpudFiles

Ok, I think your best bet is what subterranean suggested: one of those tanks isn't too much more than a pvc set-up the same volume, and it's not going to blow up if you drop it on something sharp.

@Hotwired: "My signature cannon can fire off five shots from the chamber charged to 240psi." Good Pete! You're giving me hope for my multi-shot!

my grandpa was nice enough to give me two of those tanks, but i wanted to make a back pack sorts thing. i think ill do it in the future, but not any time soon.