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Gary Hindman's Custom Model 113 and Model 114

Both guns are bulk fill. They have a silver finish on the barrel and the CO2 tube. Stocks have been redone to a natural finish. Simmons .22 3x9x32 AO silver scope and rings are connected using IA mounts

Model 113- Predator Polymags .177- 5-shot groups @ 25 yds. =.440" C-C - Avg. velocity 697 fps 25 shots ( high 721 fps)

Model 114 - JSB Exacts .22 - 5-shot groups @ 25yds. = .54O" C-C- Avg.velocity 654 fps. 25 shots (high 660 fps)



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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)
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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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