As with their real steel counterparts, they use the same mag, though some brands of STANAG (M16/M4/all NATO rifles etcetera) magazine might not fit/feed perfectly as Rugger stated.
In my (admittedly fairly limited) experience, it's usually not too much work to make a mag that doesn't want to fit fit like a champion. Had to do a bit of filing on a little nub on a JG MP5 mag that refused to seat properly in my ICS. No real hassle.
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