jmr40 put it very well I think. The 5.56 NATO is definitely adequate for the roles today's military riflemen play. Also, having a new chambering would be a LOT of money and take a long time, because we would be starting from scratch. New rifles (or maybe just new uppers designed for current AR type rifles), new equipment to make the new round, and a heck of a lot of testing, as well as a lot of other things that I didn't even think of.
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I don't always go to the range, but when I do, I prefer dosAKs.
They say 5 out of 4 people are bad at math.
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