This thing works great on my model 686-6 - LaserLyte Universal Laser Trainer Pistol

I just got this and I installed it on my model S&W 686-6 6" barrel .357 revolver. I loaded the eight chambers with used shell casings and tighten adapter so that it fits snugly. This thing worked like a charm. I shot in double action at a 13 feet away bulls eye. I didn't even need to adjust wind-age nor elevation. I had original used a single laser bullet and had to continually reset the barrel to fire the same cartridge again and again, with this contraption, I just squeeze the trigger one right after the other. It's great practice tool. I highly recommend it.