That doesn't shock me at all. I've long said that I felt the W.E. guns on co2 were approaching the 400 fps if not higher. And they seem to work best with co2, but they also use a high-flow valve and they do "guzzle the gas". With rapid firing, you sometimes will not empty a co2 mag of bb's before the gas sublimes to solid "dry ice" in the powerlet and sometimes this happens with green gas, too. The strength of the recoil spring and weight of the slide use up most of the gas energy.
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