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Step 1, get a remote sentry (using support killstreaks throughout the whole thing)
Step 2, get 1 more kill (you need to be 1 kill off getting another killstreak reward)
Step 3, put your remote sentry gun down
Step 4, get into the remote sentry gun
Step 5, get shot 2 times in the leg
Step 6, once he has shot you 2 times in the leg then you shoot yourself in the foot
Step 7, if you did it right your guy should still be standing there
Step 8, now just wait a while so you can pull out your gun (or just pick up one)
Step 9, you now are invincible

This has been posted before please search before you post next time.

Very nice might try later

This was already posted but i think the video you found is the best one yet.
It is short and easy to understand; I try this glitch again.

(with the ohter tutorials i always killed myself and i didn´t knew that i have to do one more kill after getting the sentry gun)