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When you get your cylinders filled, stick them under water and look for bubbles. I lost 2 charges because the little pressure relief nut wasn't cranked down enough.

thanks for the warning. I'll certainly be sure to check.

I lost pressure on mine too!! Just figured the pressure relief 'tab' got pushed in my bag.. but sounds like it might have been the same problem as you.

Bugger. I think it's a common issue with all paintball type cylinders

Good to know. I just passed this on to a few forums ( MoB and MontreAlers ) Thanks.
Some of the guys there bought some cylinders recently.