I use King Arms lowcaps pretty exclusively. Some people seem to need to modify the feed lip to get them to work properly, but I've never had any issue with any Armalite I've used them in, including a TM M4, CA M15 (mine and a friend's), JG HK416, a friend's JG M4, or my custom C8A2. They've all fed reliably without any issue. Although I haven't tried them with any G&G gun, G&G are take standard TM compatible mags, so I don't think they'd be a problem. I'm assuming that the KA midcaps will be the same as the lowcaps, only with different internals.
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