http://www.youtube.com/watch?v=CFA39vYryPM
It also works with many other guns and many other games.
(This is not my video, and I do not have one of these modded controllers)

yeah, that's cheating.

That's for *******.

Brilliant Idea but yes it's cheating.

Bad noob
nothing more to that but he's a noob and sucks at the game