Thats what I'm saying, the piston will not open fully. Maybe with a Longer area behind the piston with a long, progressive spring It will achieve the same flow. Still going to have a slower opening time VS no spring, and I can't see the multi-shot idea working. Yes, the pressure remaining should equ...

Well in theory this will work, depending on your choice of ammo and firing valve I believe. I think a PCP is best used for small, lightweight projectiles as not as much air is required and thus a higher number of shots per fill (which is the whole point of PCP). The firing valve will need to be tune...

But if the pressure reached 1000 PSI you'd be fine however you'd still have about 400 PSI in the chamber after the projectile left the barrel. That pressure alone would be enough for another shot so you'd have to have some way to fire another shot or to release the pressure in a safe manner. Pretty...

Hehe, nice gun.

The material list and valve let me know your from australia Good to see more aussies

What marbles do you shoot?? (diameter, where do you get them, how much)

well done on the paint job

I'm also getting infected with piston valve hybrid designs, its only a matter of time :P I imagine power loss compared to burst discs would be significant, but I'm sure different piston valve designs would produce varying power. I'm looking at it for small bore applications, just the ease/speed of p...

Hahaha, how frustrating. I still havent done any good testing yet with HGDT and the chrony, when i get a chance ill post my results.

Interesting how accurate GGDT is in the ~190 - ~275 range

I stick to PVC barrels, and sleeve them inside chrome plated curtain rods (because they're dead straight). I use these types of barrels for my hybrid and pneumatic snipers, very accurate with marbles, I can hit Coke cans @ 25m every time. I know where your coming from, i cant stand any barrel which ...

Looks awesome, what FPS does it pump out? I think your barrel should be a lot longer for that chamber setup.

what a beast, gigantic chamber.

D_Hall wrote:
Can ya just type over the old value rather than deleting it?

yep, no problems. I'm gonna try to get a couple of gauges tomorrow, and hopefully do some proper testing, I'm interested to see how accurate the current model is

Well done, Ill have to do some testing with this thing now . only bug I've found so far is when you change burst disc pressure box to blank (backspace old value) the mix(nx) value resets to 1.

It uses a piston valve to release the pressure down the barrel after ignition, instead of the traditional burst disc system.

well, Im not 100% certain on this but, I said I'd update this with ongoing test results etc so comments at any date are welcomed by me. sthorne: those photos were taken when i had a camera phone (which has broken since) and I was under my house, it was rather cramped etc, my barrels were just random...

Nice hybrid, Definitely get a marble barrel