The beamshot is well made, laser and light work well. But, here is what I found after firing rounds. I had the laser zeroed in with a laser bore sight by the gun technician at the shooting range, and also zeroed by the gun sights. After a number of rounds the laser is off zero, high and right, but stays there. Readjust and it moves again. I think the reason why is that this laser/light moves a tiny bit on the 1913 picatinny rail which at 20 yards away will throw the laser off. Most laser/lights that state it will fit on any universal or picatinny rail has a standard cross slot/key that is 5/32" (0.15625"). The 1913 rail is actually 0.206" or just larger than a 3/16". So a standard/universal cross slot/key will work on a 1913 rail, but even with the clamps very tight, the laser/light might move on the rails with recoil. Eventually, you'll have to zero the gun again at some point. If you want a laser/light that will hold zero for sure, buy a laser/light that comes with a 1913 mounting option. I had this mounted on a FNS 40S&W, standard size pistol with a 1913 picatinny rail, 4in barrel, 2 inch 1913 rail from trigger guard to tip of pistol.
Pros: well made, solid, easy to adjust, cover for ports, great Beamshot custimer service
Cons: unit is large for a standard pistol, universal mount not good enough for 1913 picatinny rail
This review was written in the old system and had content requirements that are different than reviews written today.