XM204HP user here, love them, wouldn't switch for anything else. I have a few others like the POM models, they will take CO2 but you'll snap something in your launcher before you get them to fire.
I loaded one up with 1100 psi of pressure at Rawdon to test the theory, they seal and keep the air but you basically need to use a hammer to get the valve to release.
No go.
|