For what it is worth, in the real world and using modern optics, I don't see much difference between the M16A2 and M4A1 in terms of ability to make hits. I used to shoot a lot on unknown distance ranges and with an M4A1 and ACOG, the bigger limiter on repeatable hits was ammunition (M855 green tip being significantly less capable of making shots past 400 meters or so than Mk 262 match grade ammunition).
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