I have and ICS M4 Concept and every kind of mag I've tried works pretty good(dboys,star, g&g and magpul pts) but the magpul pts mags fit and feed the best out of all that I've used so far! The other ones are kind of a bit loose and I have had a few but not many misfeeds, I don't know if it's different with the metal bodies as I have the cansoft version!
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