the CM901 with a silencer and kick is pretty good in my opnion, I use it all the time, it's status are almost as the same as the AK and in my opnion at close and mediu range it is better than the AK, at longe range it kind of sucks cause of the recoil but if you gonna be getting into longe range gunfights you can always use the ACR
The LMG are pretty much the only tier that I don't use, sometimes the L11 with thermal