I've done it more than a few times; it's not too hard if the team that you're playing against is terrible/oblivious of their surroundings. Just slap a suppressor (pretty much required) on your weapon to avoid minimap fire detection and clear your way into a flanking position. I still remember a recent Metro game where I ran down the backstairs at B, killed two guys on the way down, then ended up flanking and raping like 7-8 people on the eastern stairs leading up to B. Or that Caspian Border game (still in my recent games) where I ambushed 6 people at Hilltop while coming in from the small cliff overlooking the northern building.
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