SpudFiles

Here is a new combustion gun I designed and built a few days ago. The barrel is a duplicate of my previous gun's barrel. I used a 2" section of pipe from a suppressor casing I scrapped from my previous gun's barrel for the main section of combustion chamber. A 1.25" PVC ball valve is used for venting and fueling. I'm planning on upgrading it with a chamber fan for better venting. My next gun will be a revision of this design featuring internally mounted electronics for the chamber fan, to preserve the clean lines of this design.

Edit: The revised design will possilbly use metered propane as well.

Nice job. How do you hold it? a picture would be nice since I cannot seem to wrap my head around the idea of holding that.
Also, sadly I wouldn't say that that is a coaxial cannon, but instead an over under. A coaxial has the barrel inside the chamber, unless of course I am not seeing something.

Thanks for the correction. I've dissassembled the guns and packed them up as I'm moving to a new house in a few days, but I'll try to explain how it's held. I'm right handed, so I take the gun, and hold the ignition cap with my left hand, so that my thumb is over the button, and butt the rear of the combustion chamber and barrel "reciever" against my shoulder, or slightly under my shoulder (depends on what I'm shooting). I then hold the barrel near the breech with my right hand, sort of like a rifle. It's hard to really visualize, but I'll upload a pic in a few days.