Is this the thing?https://www.pcptunes.com/airforce-larger-plenum-regulator-for-250-257-308-357-457.html
It blew on first fill. Never was shot. Sounds like the reg failed. But it was only filled to 4300 psi when it blew. Went to bleed the hose and it blew. Ruined the tank and the gun. Now PCP tunes is saying that the failure is due to miss use. The thing blew on the first fill
Got the measurements from the blown one.OD is 2.25"Wall thickness .114"End cap .160"So even out of 7075 it is not good for 200 bar.
Problem is they are in Indonesia.