11 inch Alloy 10mm OD barrel shrouded in 10 inch a steel 12mm OD tube
fired it at 50 PSI using an 6mm inner barrel and it put an ink cartridge through a double corrugated cardboard box, it'll go up to 200 PSI but I need a new chamber first.
its a 3/8" QEV piloted by a compression fitting ball valve (happens to also have 3/8" threads) and the shock pump is a generic one rated to 300 PSI that i've modified with a hose barb-1/8" adapter
First time doing this so be gentle





