I like how small the meter is i will have to try that

i like the idea of the expandable foam. seems safer.

Wow. That is neat i will have to try that. Thanx for the How to.

I pretty sure you have to be 18, it also depends what state you live in.

I have a brass fitting that allows me to fill up a small propane cylinder from a BBQ grill tank. I have to spend about 10 bucks for about 30 small tanks worth of propane, plus I can reuse the same small tank. I got it from a CampMor catalouge. They have a web site at http://www.campmor.com

I been building cannons for about a year and a half now, and i think i am ready to build one. I fully understand the risks, but thank you for the warning.

I really like your gun. I am looking into building a hybrid myself and like the check valve assem. If you have any advice about buiding a hybrid drop me a message.