The output on the regulator is a rather puny looking 10-32 thread which attaches to what I think is 5/32 microline.
If the flow through this microline is too low, would there be any point in replacing it with something bigger or would the 'bottleneck' be inside the regulator itself?
I've put up some pictures of the beast:
Edit: as nobody seems to be biting (this must be a first in spudfile's history, no replies in 24h

What I need to know is how long it will take to fill the chamber with this regualtor as this will limit my rate of fire, I can't test it out myself as I don't yet have all the correct fittings. If the flow is insufficient to fill the chamber in a couple of seconds can the reg. be modded to increase its flow? I had thought about drilling out the 10-32 thread and re-tapping it with a 1/8, and maybe putting in another one on the other side, but this won't do anything if the flow is restricted elsewhere. The other way to increase flow would be to mod the reg for a higher output pressure but I don't know if this is possible, and it's the more dangerous option.
Any advice would be much appreciated.