I have the magazine mount that you mentioned. I had a Streamlight Scorpion in it. The biggest problem is that it doesn't have an effective momentary switching capability. You can't easily do a quick flash on an area without taking your off hand away from the grip and destabilizing the gun. After trying it a few times, I bought the Surefire weapon mounted light. It has its own rail that mounts very solidly to the front of the trigger guard. I prefer the model with the pressure switch mounted to the grip. After using it a few times, I had no problem controlling it. It comes with an additional high-output lamp module that will cook hotdogs on a wall.