QEV size

[VH_man]

Could someone give me the Specs on a 1/4 inch QEV? im attempting to make an HMG (heavy machine gun) replica for airsoft skirmishes. i am using the QEV + Saftey Pop valve for actuation. and anyone whose seen saftey pop valves go off, how far do they go back? Im thining of using that as a blowback mechanism to load the next BB.

[Hotwired]

Could be easier if you said which type you're on about (piccie!).

The type I'm using is said to be good to 300psi. Leave a couple of cm behind the relief valve for it to recoil into if you're planning on a compact design. They don't pop out more than that to open the exhaust holes.

If you have a look at these: http://www.airlines-pneumatics.co.uk/we ... ?SubCat=86 you can see the kind of distance the sprung sealing head has to go to open to the exhaust holes.

[VH_man]

Thanks, that SHOULD be enough to move the breech closed so i dont have a strafer style firing...... and i said, its a 1/4 inch QEV, the one with the 1/8 NTP exhaust and everything else 1/4 inch. it has to be below 3.5 inches, im modeling this thing off the M2 .50 cal Browning anti-aircraft gun.