More fun with QB79s ... 12g cartiride adaptor

[Bartman]

I came across a end cap for the stock pressure tube that had a fill nipple and a PSI gauge in it.
Can one simply pressurize the stock pressure tube with HPA?

What is the safe PSI range inside the stock pressure tube? How much PSI does 2 standard CO2 containers generate?

Thanks.

Here's a handy little chart for CO2 pressures with temperature changes.

[AirGunEric]

Forget the handy little chart, go with a calculator: http://www.airgunhome.com/pages/calculators.html

-third one down.