Using an AirForce CO2 adaptor to connect to HPA.

Interesting question! :fishinghole:
I have a similar question and hopefully silentwind doesnt mind if I add my question to his post?
It’s obviously a well known fact that ordinary common paintball hpa tanks utilize 5/8-18 unf threads to accomodate the regulator & pin valve assembly for most common designs. CO2 style tanks are simliarly threaded 5/8 for a simple pin valve and no regulator.
Obviously, AF air rifles use a much more uncommon hpa tank that utilizes a metric thread pitch of 18M5 (so much for made in the USA?) These tanks require such threads to match up to the AF proprietary valve.
I cant quote the type of thread that the outlet paintball Pin valves utilizes……but it is these threads that the AF air rifle CO2 adapter is designed to match up to….. The AF adapter has its own proprietary valve tuned for the physical properties of CO2 and the lower pressure that CO2 operates at….. Most paintball HPA regulators reduce the tank pressure to similiar pressure as C02 for paintball use.
So it isnt too big of a deal to use a AF CO2 adapter with most any of the vast array of paintball tanks that employ the very common Pin valve/regulator arrangement as long as the pressure is regulated and consistient with the similar characteristics that the Co2, Valve inside the Airforce adapter has been designed…..
Ok with the basic facts above , I might have cleared up a few questions that others including silentwind might have, hopefully we are all on the same page and I will now post my question if anyone is still this far along reading :butkick:
First part of my question is ….. Do they make a Paintball pin valve that is fully pressure rated for straight use into a HPA tank? The brass CO2 style Pin Valve will thread into any HPA tank with the 5/8unf thread. The burst disk would have to be replaced with a higher rating to accomodate the HPA pressures. Somehow I doubt that those pin valves are rated at 300 BAR! Yeah, change the burst disk and it likely would work but not great peace of mind or engineeringly (is that a word) sound thing to practice.
Second part of my question, if we had an HPA tank configured with a straight unregged pin valve for full hpa pressure, could we marry it to the Co2 adapter? Of course the Co2,adapter is no longer a Co2 adapter but actually a pin valve adapter. To become an HPA pin valve adapter it also must go through a couple of simple changes too…. First we have to change out the Co2 valve for an HPA valve such as the HighFlow or similiar and also the burst disk if we modify the Co2 valve and spring inside the adapter……
Ok, so our rig would consist of Common HPA tank+Pin Valve (no reg) + adapter+ HFlow valve…… Would this work ????
I say for the most part yes except that maybe the adapter might restrict the volume of air immediately available???
Really I would like to build a bigbore gun that is valved for use of a 4500 psi carbon fiber tank and not worry about overfilling a stock tank past its 3k limits. I usually go up to 3400 already in my .257… :fishing: