User blog comment:Callofduty4/Modern Warfare 3 Weapon Proficiency and Equipment trailer/@comment-101.161.12.57-20111028231350/@comment-220.157.221.233-20111028232334

And yet their real world counterparts haven't had many visual changes over the several decades they were in service. And besides, the M16A4 in each Modern Warfare games aren't completely same. There are small differences between each one of them.