My fav has to be the ace 21.i run it with a coyote site ,stubby grip and a silencer.it hasn't let me down yet apart form when u come up against a sniper at 250 m plus.havent played about to much as I'm busy unlockin all the weapons.last night though I was getting nailed with the ak5c a lot and at all ranges.seems like a week rounded weapon so il pro try this when I'm done unlockin.