Gun stats
Chamber: 22mm copper
barrel: 1" thick walled aluminium
valve: 3/4" QEV
operating pressure :150psi
One of the more interesting features is the breach loader, I have managed to avoid the use of a pipe clip in here by using a thick walled barrel and threading the bolt directly into it.
the suppressor also works and probably took longer to built than the rest of the cannon put together, it can be screwed on and off of the barrel.
Finally, Ive been lurking around here long enough to know you guys like some damage pics, enjoy

http://uk.youtube.com/watch?v=0m52-bVbNJc