Avoid, there's a reason surefire dropped it from their product lineup in a year. - SureFire XR2 Ultra-Compact Rechargeable LED Pistol Light w/ Laser

These have been discontinued by Surefire after being on the market for only about a year. You can't even source batteries for them from Surefire's site now. They seems to be plagued by battery discharge and mount issues. I've had two batteries for mine both self discharge in and out of the light over time, in addition the mount is very prone to shifting, partly because Surefire only recommends a 6in/lb torque on the mount screw for polymer frames, it's simply not enough to keep the laser zeroed under recoil or if the handgun/light takes an impact.

I've also had problems with the adjustment not holding, it will stay zeroed for awhile, then start drifting. Could be something in the adjustment that is not holding, or the lack of mount "grip".