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The AN-94 Assault Rifle is the last assault rifle you unlock in Call of Duty Black Ops 2. It feels similar to the AK-47 in previous version of the Call of Duty franchise. The AN-94 has a twist, the first two rounds of a burst are fired at a higher rate. This guide explains how to use the AN-94 well and what the best class setup for it is.
The fact that your first 2 bullets fire faster than the rest is only really important at medium to long range. There you can burst fire the weapon by repeatedly pulling the trigger a few times per second. This buffs your fire rate considerably and makes you much more deadly. However, at close range you should be focusing on getting your aim right so burst firing may distract you, although it still has the same advantage.
Other than that, the AN-94 can be used a bit more aggressively than the other assault rifles. However, at anything but close range aiming down the sights is important and cover is important too. At close range hip firing is good, but be sure to strafe whilst doing it too.
The class setup I recommend is the following:
Flack Jacket and Tactical Mask are pretty standard, I tend to recommend them a lot since getting killed by random explosives and getting stunned is pretty annoying. Flack Jacket and Tactical Mask reduces the impact all of these have. I also usually recommend Toughness at it reduces flinch when being shot which is always useful.
For your lethal Semtex is better since the AN-94 plays a bit more aggressive role. Concussion Grenades or Flashbangs are also very good. As the AN-94 tends to be better at being aggressive that also puts you into circumstances where you run out of bullets in a time of need. Use a pistol secondary to switch to instead of reloading to finish off enemies.
Since the AN-94 is best at close range being more effective at said close range is important. The Quickdraw Handle lets you pull up the sights much quicker which helps with fast combat. The Fore Grip lets you control the AN-94's recoil better enabling you to be more competitive at longer ranges.