Strange, mine all seem to fire fine (2 x 5.1K and 1 x 3.8 baby), unless my propane bottle is low when I gas the mag. I have been having problems with my CO2 mags though. I'm not sure if they are plugged somewhere or there is a valve screwed, but both of my CO2 mags are screwed and don't cycle the gun properly, even with new powerlets. My green gas mags all work flawlessly, although they are definite gas hogs.
