User blog comment:Qw3rty!/September 4th Patch Notes/@comment-1990578-20120904025340/@comment-5041037-20120904063829

Answering this question, it's because it has one of the highest fire rates with relatively low vertical recoil. When the M16A3 also possesses the shortest reload time of all Assault weapons, it becomes a force to be reckoned with.