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Alright, here's one of the possible load outs for the Phalanx Mk12 armor system, given its wearer is able to lift 3tons a single 20 auto and a backpack unit mixed with various other equipment would be carried and used effortlessly, the backpack, not shown here, is able to contain around 2000 rounds. The rounds can vary from live ammounition to various non leathal (fictional) rounds like gas rounds or rounds that leave chemical markers to allow for tracking and identifying targets.

Like the Archer missile racks there's a load out type pertaining to leathal and various non leathal round types, and like the armor itself the weapon once used up or damaged goes on a cool down for a few minutes or so before spooling back up and being available again. Also like the armor, continued use and using up of that load out in a single day results in the cool down taking longer to spool up for a new go.

Some round types might require link fed instead of being belt fed. *shrug*

Modeled in Google Sketchup 7.
Modeled by

Enjoy~