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 photo 63f5b325-0274-4312-9dbd-2effde5b3715_zps0x27orls.jpg

Alan Alford's build

2250b Tube for later move to bulk CO2.
12" .22 Caliber Barrel from Doomsday Backpacker
Brian & Assoc. Alluminum Breech with 2 barrel screws
Original site rear
Pin site on Custom Mt. Airguns Muzzle Break
2x1 Centerpoint Scope with UTG dovetail adapters
Mountain Airguns Custom Bolt and Handle
Mountain Airguns Custom Power Adapter and spring guide
B&A Boss Valve for extra Power

Built mainly for fun and to shoot at local Field Trial Pistol Match.

It currently it shoots a 14.3 Crosman Hunting Pellet at about 530 fps in a 72 degree room for 8.92 FPE.



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Actually, Ron, if the checkvalve is efficient, there's not much difference at all...

November 21 2011 at 11:42 AM

Steve in NC  (Login pneuguy)
Troll, Banned User or Assorted Delinquent
from IP address 68.221.9.77


Response to Does Jame's pistol shown in the link...

...between accumulated pressure in the valve and peak pumping pressure - as little as 10 or 20psi in fact. That's hardly "huge." I would have said something more like: Chump change.

But the answer to your question is "valve." It's very useful, by the way, to be able to have the valve's exhaust external, where you can hear the "hiss" and so have immediate (audible) feedback as to when to stop pumping.

Meanwhile, if regulation on the pump side is the specific goal, here's another way to defrock the feline. Here the sudden increase in piston bounceback when the spring starts generating headspace is the feedback to the shooter's pumping arm.

[linked image]

Steve

 
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