It will allow you to use any armalite mag you want, but it is designed to use highcaps. You have to fill the whole upper part and have the highcap mecanism feed the gun.
But you still can use some normal low/mid caps in it. I only find the battery storage to be usefull (a large 9.6v can be fit in there). Otherwise I don't like the look of it. Still if it floats you boat...
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