The way to go! - Crimson Trace G-Series Full Size Glock Laser Grip

Easy to install, best if you remove the slide, but you may have to try the alternate pins for the correct fit. If you have ANY doubt, just get someone at the gun shop, who's familiar with it, to help....no gunsmith required. For the full size Glocks this seems to be the BEST choice, but you have to get accustomed to the laser's offset from the bore and decide what distance you want to zero. I've ordered another one for my S&W revolver. I just wish they had one to fit everything.
Pros: automatic activation, adjustable, bright
Cons: angle off centerline of bore

This review was written in the old system and had content requirements that are different than reviews written today.