Barrel lenghth is important as m855 is supposed to penetrate then break apart for it's wounding power, and for the necessary velocity a mininum barrel length of 16 inches is need. That's why m4s suck. They seriously could add 1.5inches of barrel onto the m4 and room clear just as good.
As to the m16 use in the army, my friend was issued an a2 in the army and put on a collapsible stock. Basically the same gun as an a4 at that point.
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