I was a cop working in DC (5D-if you know it true ghetto) and living in Suitland, MD (if you know it even truer ghetto). We learned some gun disarms at the academy and they were without a doubt the gayest things ever.

Then I took some Krav Maga training...these are some good disarms. Very fast, very effective. There is a gun Krav video out I believe Krav Maga Homepage

I am also of the belief that the situation sets up whether or not to attempt a disarm. You have to kind of play it by ear. You know what they (who the hell is they?) Train for the worst but hope for the best.

But of the disarms I have seen I like the Krav Maga ones. I have seen some "Traditional Chinese" disarms also, and they had some good merit. But you need to train them obviously...keyword SPEED