I can say without a doubt that headshots are KEY to using the AK-47. If you can control the recoil and nail headshots, or at least upper body shots in every engagement you will have lots of fun using this weapon. You probably know this but the AK has a "T" shaped recoil pattern. If you can train yourself to "aim" the recoil and not the crosshair you will master the weapon quickly. My strategy, which is most likely nowhere near ideal, is to aim for the head, pull the trigger and hold, if the first shot isn't immediately a headshot then I sharply pull down down on the weapon- this way the recoil drifts quickly up to the chest/head boxes, which usually lands me a headshot and if not a quick few shots into the chest for a kill. Obviously, training yourself to do this is risky since a slight error could result in your death, not the opponents- like I said, if you want quick, clean kills, headshots are key, however risky.

Also, burst firing in 2-3 shot pulls is a great strategy for med/long range. You NEED to keep in mind that tap firing any weapon too quickly will result in the weapon recoiling as if it were being fired in a long burst-- at med/long range this spells instant death.