Yeah I always wondered how much "Sustained Fire" the C9 could take after heating up both barrels on 400 rounds and the first one still being toasty hot while we swapped it back. No question though I thought they filled the squad role very well.
Apparently the one of the best SFMGs was the Vikers which due to the water cooling could keep up neer continous fire for hours on end. Not exactly portable though.
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