Hmm, I currently own a MGC P7M13, I can tell you that it's probably not a good idea to use propane on it. MGC stuff is pretty classic now. Your best bet is just to stick with dustergas. Generally all the mechanics in MGC guns are different and aren't like modern gas guns, shoving propane in there to go through all that could really screw with the internals, probably not instantly noticable like in a GBB if your slide flies off. It would definitely decrease the lifespan of your MP5K quicker though probably.
Just wondering, how many mags did you get, and what's the capacity?
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