Good light but has some issues - Streamlight TLR-8A LED Weapon Light and Laser

They provide several adapters for a snug fit to your specific pistol. However, the one designed specifically to fit my pistol (XD) was flat but my XD's rail surface was slightly round. Therefore, even tightening the mounting screw as I could, the light would very slightly rotate. This would cause the laser to be off target. I ended up filing my pistol's curved surface to be flatter. The laser seemed to stay on target.

Also, the laser adjustment Allen heads are very difficult to adjust. They are TIGHT, and I was fearful of stripping an Allen wrench or Allen screw on the light. I pressed on and final got it adjusted.

Make sure Allen wrench isn't worn or you may strip something.