SpudFiles

Here is my 4in Barrel sealing coax

Chamber size (nominal):4in x 65in
Barrel size (nominal):2in x 96in
Piston: 4in PVC rod
Sealing face: Old mouse pad
Main firing pressure: 30psi (due to space limatations)
Max firing pressure: ~120psi
Main ammo: Cast concrete slugs, Golfballs
Range at 30 psi: ~700-800 ft (Golfball)

Here is the completed cannon:


Here is a closeup of the back:


Here is the barrel with the front glued on:


Here are all the parts laid out:


The back has the fill valve, a safety pop off valve, and a 1in ball valve for venting. Currently fired at around 30psi due to space limitations.

Very nice gun you got there! I'd love to see some damage videos

We'll see about shooting it through some plywood later this week

Awesome gun!!! Is the the piston serviceable I can't tell from the pictures?

no it is not the cost of 4in threaded fitting make my sob quietly at night