Originally Posted by oldman11
Well the best way is to carry in a leather holster with a thumb break. Also be aware of your surroundings. AND practice, practice, practice.
I would put absolutely no faith in a thumb break to prevent a gun snatch.
It will keep the gun in the holster if you are running, jumping, rolling around on the ground, sky diving, swimming, in a car accident, or doing gymnastics, but even a total klutz can figure out how they work without ever putting their hands on one. Generally speaking if you can present the gun quickly from the holster with a minimum of thought and motion, so can someone else.
If I were going to make open carry a habit I would probably buy a level III security holster.