matt is right.. do terminal be far it is the best one i have found.. Use the settings gamekilla suggested and make sure you're on the ranger side.. or whatever the second one you get to pick.. you will know if you picked the right side if you start off inside the terminal.. also don't forget to put it on headshots only.. this will help out alot..
when on terminal.. the other team will spawn underneath the nose of the plane infront of the tanker truck.. if done right you will not have to move and they will spawn right infront perfectly.. also if you are running low on ammo and don't have scavenger.. just put COPY CAT on the player you are killing

hope this helps and have fun..