This is confusing to many players because when they pick up an enemy weapon, it works differently than the US version. An AK-47 removed from a fallen opponent is fully automatic, more powerful, but less accurate than his M16. But when his opponent had it, to him it "was" an M16. The important thing is that each weapon behaves as the owner sees it. It transforms when it is picked up. If people pay a lot of attention might notice that the enemies weapons behave wrong, but it is hard to notice.