How to make a simple PVC breech loaded air cannon

This is how I made my breech loaded air cannon. It is not very complicated or even well made, but I want to demonstrate how the different PVC fittings can be used to make moving parts. This was a fun project for me and a learning experience even though it ended up not working as well as I expected. It can be made a lot better by simply using more epoxy for the barrel, a larger valve, and an o-ring to seal the bolt when it is closed.