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Challenger Arms Corporation Plainsman (CO₂) Pistol

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jackssmirkingrevenge:
Thanks for the information, would you know the approximate date it was made?

Pneumatic-Addict:

--- Quote from: DWTrull on June 04, 2023, 08:51:14 PM ---You have a second variant Plainsman. They are label C-22
Ther are 4 variants of the Challenger CO2 plainsman pistol

--- End quote ---

Dave,  Just curious which front sight would be correct for Jack's gun; the small single-band one or the figure-8-looking one?

DWTrull:
single band

jackssmirkingrevenge:
I made an extended endcap with a Ninja type fill nipple and replaced the two aluminum rings to seal the valve body with new ones machined from Delrin:



When I first tried it out the valve stem seal leaked and the material had obviously dried out and lost all flexibility, so I dug it out and replaced it with a Delrin ring and that did the trick.

I gave it a quick go at 1200 psi and boy is it loud:

jackssmirkingrevenge:
Did some testing with 14.3 grain Crosman pellets and the power adjuster backed off slightly and starting at 1500 psi got the following velocities in feet per second:

404 - 401- 389 - 394 - 384 - 379 - 365 - 363 - 377 - 343

Pressure drop was around 500 psi.

Firing in slow motion:
 




Powder adjuster details, the central part is what strikes the valve stem and unscrewing it reduces

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