On my other guns I used a 2 1/2 lb extinguisher as a chamber at 120psi.

If I use a 20oz. CO2 bottle how many shots should you get?

Sorry not playing dumb it comes natural what is a shock pump?

Please go easy on me here. I have made a couple of air cannons in the past and used them at several indoor football games shooting tee shirts. The guns I have made are big and I use a SCBA (like SCUBA) tank as my air supply. My question is how should I go about building a smaller one that I can ...