Free for All is a mulitplayer mode that is every man for them self. You are not on a team and everyone else is an enemy. This mode can get pretty intense because there can always be someone around that corner. Sometimes I come across two people duking it out, and I can kill them both or one of them.
I like to use an LMG usually the M60E4, but any light-machine gun is good. The reason why is they have a huge clip. This way you don’t have to reload as often you can just keep moving around and looking for players.
Stick to one area of the map. Not just a camping spot, but a couple of buildings or a corner of the map that you can roam around in but can pick people off without being spotted first.
Bandolier – Unless you like picking up random guns you can run outta ammo quickly from all the firefights.
Double Tap -Depending on the weapon you use but for the M60E4 double tap is an absolute must for me. Without it the gun fires too slow.
Martyrdom – Because of how chaotic it gets martyrdom can give you some free easy kills.
Three Frags – For shipment map, just spam them when you spawn.
As you can see from the video I stay in one area, and I don’t reload till I know there is no one around.