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The smaller "nut sack" box mags will work. They're easier on the support arm too since you don't have to hook your arm out and around the box mag (at least I found it so).
They're kind of tough to fill through their little port...but you can actually take the whole bottom box off the mag to fill it and then put it back in the case and zip it up. I found that they feed a bit better too. Pressure switch vs. sound activated...so the downside is that you need to put the pressure button somewhere (I put it under my stong hand thumb).
Re. the green box...the wiring is pretty lousy in the A&K box mags. There's not much that can be done re. how the side cover snaps on/off. I had the same issue of BBs getting down into the feeding mech....but I switched over to a nut-sack box mag.
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