I am doing Krav Maga and have learned two disarm techniques.
1) Gun in back, arms up, rotate, lock gun arm, pound away on them with elbow/fist/kick until I can reach over and pull gun from hand.
2) Gun held at head, use arms to push gun arm up and left or right, moving head away from muzzle, kicking in groin, and elbow, rotate into gun arm and remove gun.
I am sure there are a lot of other types and methods. It is an area I want to learn a lot more about.
Please post your favorite gun disarm methods.
Cody