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I suppose it depends on what you are doing.
You ,might be slow firing a target string,and so surface area and a dissipation rate might matter.
Or you might be a part of a small military team who is breaking contact with a "rolling disengage"
Which involves consecutive full auto mag dumps.
Assuming the fleeing team makes it to an extraction aircraft, cookoff hot barrels are undesirable. Fluting won't keep up, and as far as I know,the best solution is trading the pencil barrel for the additional mass of an H-bar. More heat sink.
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