I crammed 6 1/2 inch segments REALLY tightly into it, and glued gasket rubber onto the ends with epoxy. it's airtight, I checked it in a bowl of water, and no bubbles came out.

@Jook, I guess the barrel is a little short, but I wanted it to be easily carried. I made it for my dick cheney halloween costume, but I couldn't get it to fire so I just took the shell with no innards. I'll put a longer barrel on later. The piston is loose enough to bang around when I shake the gun...

First of all, hello spudfiles, this is my first post, and I wanna thank everyone on here for inspiration and all their awesome s***. I've got my first cannon coming along. It's pretty aspiring for a first cannon. I don't know much spudding lingo, like what porting is, but it has a 3" chamber a total...