It's a gun I used a lot from very 1st time I unlocked it: simply because it's one of my favourite rifles, and it's German. And, in reality, one of the most accurate and reliable AR you get.
Over a period of many months, DICE made patches, upgrades and so on. Now. The gun's a "noob" gun cause of how quickly it drops the enemy.
I do not recall he M16 ever being touch. Like it's DICE's baby or something... And that thing also drops enemies quickly, if you use it right.