I took apart the "finished" gun that I posted a few months ago and rebuilt it to feed directly from the regulator paintball style.
I also rebuilt the solenoid to QEV attachment: now when the solenoid driver strikes the pin of the presta valve that pilots the QEV the air that is released pushes the driver back re-cocking it and closing the valve super quickly.
I built a circuit that allows the solenoid to be driven from a capacitor bank that are charged by two 9V batteries (seen onboard in the picture in a project box. Adding or removing capacitors allows me to adjust the dwell time of the solenoid I currently have it opening the valve for 30 milliseconds. This also allows the trigger to be pulled and held while only actuating the solenoid one time (like a semi auto marker) the capacitors recharge when the trigger is released.
The regulator is set to 400psi.
The tank takes 650 from my fridge compressor.
I get about 50 shots before I start to loose pressure and about 80 or so before it is empty / not firing properly.
The QEV is modded with a spring and a 0.32mm hole in the piston. For high pressure this is the best setup I have had.
I can get about 2-3 shots a second but it is limited by a number of factors including length of stroke of the solenoid, venting of exhaust gas around the solenoid driver and refill speed of the chamber by the reg (I could use an expansion chamber but I'm trying to keep it compact.
The barrel on there is a shorty muzzle loaded 8mm aluminium number that shoots 8mm steel ball bearings It's ported and is quiet enough to shoot inside without pissing off anyone.
I also have a collection of other barrels including a blow through bolt type and a "Barrage barrel" type that I made with a neodymium magnetic detent and the hopper in a vertical bottom fed position (0 double feeds and surprising fire rates / power). None of them look like much because they are all sleeved in polly like the one on there.
The red dot is held on to the top of the QEV with epoxy

Just a little bit of exposed wiring...

I might upload some schematics of all this MS paint style so it makes more sense to everyone.
It's basically a hammer valve piloted QEV with an electric hammer and gas re-cocking.
Spudding's not dead it's just resting.
Edit:
Schematic