User blog comment:Callofduty4/Modern Warfare 3 Weapon Proficiency and Equipment trailer/@comment-112.202.33.89-20111103025905/@comment-1840877-20111103203922

It won't make any difference. Remember, the M16A4 fires a 5.56mm round IRL (if my memory doesn't fail me), and look at how powerful it was in CoD4 and MW2.