Except that it's a gas at around 800 to 900 PSI when in the valve area since most of the 1:3000 liquid to gas was done back in the bottle or line. So the expansion from there to the barrel and bolt face is pretty much the same as with HPA.
My own thinking, which I can't prove, is that CO2 is a more dense gas so it hits the works with more of a punch. But where my logic (CO2 IS a heavier gas than just "air") falls down is how does this work when you end up having to reduce the hammer spring tension to make up for it and keep the ball velocity the same?
I had a "Paintball God" moment once.
Like Al Bundy's Polk High football moment I live on
for the slim chance of repeating that one time
miracle in some small way.........