I'll second that... Carbine with holoscope still beating me across a map with the dmr.... Embarrassingly so. Unless a headshot is involved.
I have to say that I may have forgotten about the CAR SMG a little bit...That gun is a beast with counterweight
The G2A4 rifle, hallo sight, with match trigger is by far my favorite. After using it for gen 7, it has become my go to. I love facing off with the carbine, and getting that everlasting headshot kill, knowing that my gun setup will show up on there kill screen!