Paintball Mortar

 This project was somewhat painful as it required a bunch of custom parts but I like the end result. It has both 1.5" and 2" removable barrels. It has an extendable folding front leg and a rear pivot. I also added a quick disconnect pin so you can just pull it and remove the front leg. Notice there is only a bracket on the back. It will be attached to a steel plate or something similar. It uses a direct line in, has an extra tapped tube into the expansion chamber that currently has a burst disk on it. It could easily be swapped out with a gauge. I won't go into all the dreary details of the construction as I doubt anyone other than me could duplicate it anyway. 
 
 
Shown with 1.5" barrel, and front leg fully extended.

 
Shown with 2" barrel, and front leg fully extended. 
 

Front leg hinge with quick disconnect pin. 

Extendable front leg 
 

Instead of using a heavy plate on the back, I made an H using thick aluminum stock where it touches the ground. 

 
Close-up with tank attached and ready to fire

Mortar disassembles for easy storage and transport.