I havn't seen a guide out for this yet so I thought I'd make one.
*For any Team match (Note: this glitch is done when the game hasn't started yet you will see text above your crosshair "Waiting for other team" this is the only time you can do this glitch since we are using the death affects from the game being started.
1. Assuming the game has ended and is starting the new map or new game quickly make your way to it by clicking X rapidly so you can be first in the game once yoiu enter the game do not waste time to check if it has started yet quickly enter start menue and change your UNIFORM (Not team).
2.Now wait for someone to enter the other team causing the game to restart giving the death affect we want. You will notice your players body goes invisible for a second and then suddenly dies. That means it worked, Now Before you hit the spawn clock quickly leave game and return.
3. Once you have enter the game room choose the uniform you have switched to, sit on that screen for atleast 4 seconds and now enter the game. If you do not see a duplicate of yourself on the score board that means you have succesfully enter the gliched slot, But if you see a duplicate of yourself then you didn't enter the slot succesfully. Try again you can simply leave game and return to it, but this time try the same uniform you've chosen in the first place.
Quick tut->
->Enter game.
->Make sure teams havn't joined.
->Switch uniform.
->Leave game when "game started" and return.
->Choose the uniform you change to.
\-->Open a grenade to see if your Godmode.<--/
[Credits=NCR CodeX] to this guide and next to discover of this glitch.[/Credits]
have fun.