Hello, I go to explain with more detail. I got one Walther CP2 Pistol, two-cylinder when I fillings with Co2 from one fire extinguisher with one of them when unscrewing giving me a laud Bag!
the valve does not shut properly ( not is overfilling problem even with low filling dose the BANG!
The adaptor is Ok I fill other cylinders without any problem.
I change the O ring on the cylinder but I get the same problem. I suspect the shout off valve problem.
I hope to explain myself god