Now I have got some more parts for it and it works like a charm

It has a 40mm barrel about 3 feet long, a 75mm chamber little over 2 feet, modified Hunter Jartop sprinkler valve, over and under configuration, 0-100psi pressure gauge, scharder fill valve and 3 white cable ties

I finished it a few days ago so I will really test it on the weekend and make some nice vids of a TV getting destroyed

Now for pics.