Never said that you need a 20 inch barrel in order for the 5.56 round to be accurate past 250 meters, just that the extra velocity of the 20 inch allows the round to reach its full potential. Which is to yaw and fragment in flesh, which for me is a distinct advantage.
Other than that its all personal preference, but I personally have never found a 20 inch barrel AR to be unbalanced, in fact to me its smoother than my friends 16 inch carbines
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