Not recommended - Crimson Trace Rail Master Pro Universal Rail Mount LED Laser

I have another Crimson Trace product that has worked flawlessly, so I expected better from them. My problem with this device is the mount. It is held in place simply be friction on the sides of the rail, not engaging the tracks on the rail. The first time I used it, it slid forward on the rail a little with each shot. It was not loose enough to slide manually but it did move with the recoil. I re-positioned and tightened it a little, but it broke in the first 10 rounds. I had it on a Sig P320 9MM full size -- so not something that has an especially strong recoil.