cant help but ADVICE
- do it on Alpha Site (interior)
- get two players to sit by one area (near health packs n guns, next to the sniper spawn)and look over across the centre
- get two players to sit by the other (near shotgun spawn) and look over across the centre
- stick with the magnum for jackals and grunts, take them out before they get inside to stop annoying grenade throwing etc
- band together when facing chieftans and hunters, move around them and assassinate them or wear them down
- dont get cocky and run into the middle, only do that between each wave to get ammo
hope this helps