When I bought mine from the AI table at last years Airsoft convention they told me to leave a little gas in them like gbb mags. But as cetane said they were empty when I went to grab them for next week's game, even when left full. I didn't feel like filling them every few days so I've just been leaving them empty ever since and they work just fine. I just make sure to keep the seals lubed.
Last edited by Kozzie; February 17th, 2012 at 17:21..
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