Googling and looking through my book collection, I can't find anything that gives a practical ROF of less than 200 rpm/barrel and a cyclic rate of 800 rpm/barrel. I would guess that a trained gunner might manage short bursts of 3-5 rounds/barrel, but probably not single shots. The barrels are also linked in their firing mechanism, so you can't fire one barrel at a time unless you don't put a belt in the second barrel.
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