because JSR posted his update I feel obliged to do the same
even if I don't have anything worth showing
and my cheap batteries are almost dead
I planned to use epoxy but I couldn't find it in my town so I bought a 3/8" T that I needed to build the loading mech completely out of fittings (I am sure I had one somewhere in my basement anyway but I couldn't find it... my father must have
borrowed it or something)
the design of loading mech is basically the same as the one used on the previous (16mm cal.) version of this gun...
this time I decided not to cut ports in the barrel but to use a small plastic T (exactly the same as the one presented in my previous post...) and hot glue it inside a 1/2" iron T... thx to this the barrel is now removable
but don't worry hot clue and the plastic T don't handle pressure... the idea is that the iron T is sealed upon firing by the bolt attached to the air cylinder so there is no pressure differential acting there...
those parts are there only to guide the ammo (the plastic T), to reduce dead space and keep everything in place (hot glue)
becasue it's late now I could only fire 10 or so shots at 100 psi to test the loading mech.. so far it looks promising
ohh.. until my shipment of fittings arrives I use the gun as a high pressure single shot gun with interchangeable barrels...
that's why there is a BV as the pilot valve and the 5 way spool valve to test the loading mech....
on the final version there will be a 3 way manually operated spool valve to operate teh air cylinder and pilot the QEV
ohh threads on 88g cartridges are very close to 3/8"... size isn't a problem but different twist rate of the threads is... you can only screw it in full 3 turns, which makes it pretty tough to both seal the cartridge perfectly and pierce it... so I might need to buy a proper NPT-to-metric threads adapter
It's down to the heavier, slower projectiles deforming the plate as opposed to punching straight through like 
