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You have to choose a different class straight after you die, personally I've known this since cod4 was new but I've been meaning to post this for a very, very long time but just forgot and stuff, it's good for cage match, killstreaking and just basic boosting. This can also be used for what was called '

eath Looping' in a different online game I used to play, if someone does this and you continue shooting at their head with fmj and they spawn instantly you can kill them 2-3 times with one kill and it counts as an fmj penetration kill.
If someone would like to record this msg me via ngu.
I found this and I am 100% sure no one on ngu has ever posted a tutorial for this but some people would know, props to oneinfamous for help testing some of it.