The Challenger Arms Corporation Plainsman (pneumatic) air pistol...

[JimmieDee]

DT, your bulk fill CO2 Challenger. Is that bulk fill only. Or bulk fill and pump up? Or bulk fill and 8g CO2?

All the best,
Jimmie

[DT Fletcher]

DT, your bulk fill CO2 Challenger. Is that bulk fill only. Or bulk fill and pump up? Or bulk fill and 8g CO2?

All the best,
Jimmie

It is bulk fill only and cannot be converted to pump up. I believe that the guns could be made either bulk fill or 8g cartridge.

[JimmieDee]

I have to say that I am aware of the issues with Buna-N and nitrile o-rings and their expansion when exposed to CO2 but I have been using a Buna-N o-ring as the end cap seal for a few days now with no expansion issues at all. I’ve probably gone through four or five CO2 capsules. I never leave full or partially full CO2 capsules in my guns so they only get used fo a short period before the cap is removed and a new cartridge is fitted. So I think it is entirely possible to use “standard” o-rings on the end cap.