Use a highcap/midcap mag in the side magwell.
Modding the box mag will be tricky since they slide-lock in and still feed from the side-magwell.
Most times we set the ammo limits so that riflemen have 300 in anything but highcaps and LMG/SAW have 1000 (and yeah, they won't all feed) That puts them at a ~3:1 firepower advantage which works for most game dynamics of balancing "realism" with airsoft-reality.
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