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> One person with an M-16 could take out an entire massive army of people wielding spears

I have to disagree. All it would take is for this army to surround the person with the M-16 and wait for a magazine change, then hurl 50 spears at the hapless pincushion. And that's not counting the probability of the rifle overheating, jamming, etc. after long enough.

I realize I am taking this probably too literally, but my point stands :)