That's a good question. I figure it would be three sets of six. I don't know whether these are in a row or in turn. This deserves to be checked. Could some Mg's be twinned for more fire power, or could more than one gunner fire from a same place? I really don't know, but considering the huge size of the cockpit I wouldn't be surprised if there are two or three sets of Mgs instead of one.

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