My personal opinion of the best ICR class setup to win the majority of your gunfights against any gun at any range.
Optic: Reflex
Attachments: Double Grip has practically no recoil even when the trigger is held down apposed to bursting with the AR classes. Either FMJ or Long Barrel works great on this setup.
Gear: Acoustic Sensor allows you to hear enemies easier as well as get a red outline on your mini-map.
Perks: Tactical Mask works great since the new update allowing you to have more resistance to enemy equipment. Gung-Ho to be able to do reload at sprint and fire while sprinting. Dead Silence to move quietly.
With this setup I can guarantee that you will be able to gain more kills per game and work towards your kill streaks. I go to this class many times especially if I am on a losing streak and cant get a kill.
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PSN: Formula__45