I made a burst seal gun, I got it to shoot around 40' with 4 layers of plastic bag (search "burst seal" for a full explanation) I used a bike pump and two pieces of PVC. I will post pictures soon, but I'm in a hurry right now, they may be posted tomorrow.
The pressure sorce was a foot pump, and I just smashed bag between a big and small piece of PVC.
I hope to put a better barrel on it, and then maybe a burst-shell system of sorts could be installed, and possibly a breech.
Thank you Badger
I wrote this in hurry, really sorry I can't post pics right now.
Got more time, here's some pics:
The valve/pump connection
I makeshiftly connected the pump by wrapping layers of duct tape over the end of the tube, and sticking a basketball inflator needle through them. The adhesive made a resonable seal.
The burst seal is just crushed between pipes, if you can see that.
I got it to shoot around 15' with no burst seal, and in the open (at an upward firing angle) with 5 layers of bag, it got around 50' (That's an approximation)
Edit: added bottom section
Edited by Jergling, 11 March 2007 - 07:29 PM.