a light is a bad idea on a home defense pistol, in police work it is different, you want to carry a small surefire flashlight that can go on or off. With a light on your gun, you have to point your gun at whatever you want to illuminate, which means you could accidently point your fine Glock at your kid, or family dog not meaning too, plus, with a light on a handgun, it gives your position away to an intruder, a very dumbass move, that could get you killed. carry a flashlight, don't mount one. Your non shooting hand=Glock Your shooting hand= flashlight w/ strike bezel, that way if the assailant is very close, you can strike at him. If not then you can open up on him. FLASHLIGHTS ON HANDGUNS, EXCEPT IN POLICE WORK IS A VERY BAD IDEA.