From Iron Man's Iron Manual Page 24:

This is another of my discreet response devices which are included in my Mark II War Machine. I am delighted at its compactness and horrified at its concentration of deadliness. But this is what is needed to be compete on the battlefield.

This is similar to many conventional electric mini-guns which are carried by various military aircraft. The compactness is achieved by moving the driving motor into the center of the unit. Surrounding it is a spiral packed magazine which carries 1,800 caseless, electrically primed, spent-uranium cored armor-piercing rounds or ammunition.

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