So the m4a1 is totally busted, I try to shoot something 200m with an m4a1 acog. My m4 is full quality and so is my scope. And it's not only the acog, iron and red dot is also crap. The shots spread like suppression in BF3.
Here is a video proving: https://www.youtube.com/watch?v=MWOX6gIw4fs