i dont use my ak at all, so i havent unlocked anything because i really dont like the gun that much. but if im low on ammo and come across an AK-47 with fmj + holo/silencer/extended mags i like to pick it up
I go with the silencer because it gives you the benefit of not being seen on the radar while shooting and it makes perfect sense since the ak already has a lot of damage so it wouldnt be hurt as bad damage wise by the silencer.
You really don't need extended mags on the Ak47. The rate of fire is slow enough that you shouldn't be wasting an entire maganzine on more than two people if you're accurate enough. Got a 4 kill streak on one mag from a Ak47 on search yesterday, just proves the point.
I'd go with silenced. The weapon is EXTREMELY powerful with stopping power, and the best part is you get to keep you position as long as a UAV is not up (without cold blooded) However if you can't use the iron sights effectively, they bounce too much making it hard to fire automatically from a range, then put on bling and attach red dot. Red dot is more effective than holographic on the Ak47 in my opinion.