CCM guns are cockers basically and when cockers were initially designed they were run off of c02 and no regulator and Vaseline was the suggested lubricant to use. So their is no reason that you couldn't get a T2 or S6.5 to work with c02.
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Originally Posted by freebird
lube the shaft and warm the o-ring up in your hand by rubbing it back and forth between hands. then it should go on easier.