This might be a few years late but I just had a question. Did you screw the chamber to the outer layer of pipe? Or is it just a friction fit? I am making a cannon quite similar to your design and it looks like your walk through video no longer works. I hope you see this, and thanks for all the info ...

Hi Again Spudders! Here is the newest addition to the family! I call it "The Jackal", a silly reference to the Bruce Willis movie. [youtube]https://youtu.be/UlamXHUH2hk[/youtube] [youtube]https://youtu.be/rFpx49GSC_g[/youtube] And a walk-through of the cannon: [youtube]https://youtu.be/NwEjxlR_6lA[/...

do any of you know about a 2in check valve that is rated to 4500 psi