hahaha! kick ass game!
that was fun! the best way to kill cpu players is to go to the junkyard, get all your players on the top of your side and keep throwing grenades at them, most of the time they get stuck in the pit, when the only survivors are in the pit, throw a grenade at them(in my case, they where in the same spot) and boom! killer attack, they should now be easy enough to headshot now.