Lasers and Glocks seem almost like peas and carrots. The only thing is, these neat little attachments often add bulk to the old G-gun. The best of both worlds however is to have a laser that fits the gun, yet kept it in the same design specs. Oh wait, that is out there.
The laser dilemma
For generations Glocks have had an underbarrel accessory rail that ran along the side of the frame. This proved ideal to those who wanted to add a target-referencing visible laser to their firearm. However, this bulk meant special holsters, a larger profile, different carrying drills, and often even ruled the modified pistol out of being used in a concealed carry situation. What good is the laser on your pistol if it's at home in the safe and you run into trouble in the mean old real world out there?
Take a look at your Austrian-designed polymer framed war god. At the end of the frame, directly under the barrel, you see the recess for the guide rod. What if you took the factory supplied OEM guide rod out, and replaced it with one that was to the same spec, only had a little extra capability to it? The capability we speak of is an active laser.
LaserMax has been making these for the past several years, both in red and now in green. They have seen extensive military and police use during that time which makes for one heck of an impressive beta test. Prices run anywhere from $260 to $400 (we suggest you shop around).
For that, you get a laser/guiderod combo that can be set to either pulse or steady-on. The weight of these guiderods adds practically no extra heft to the gun, while keeping it in the same profile that it left the factory with. This means no holster changes, no grip changes, nothing different-- except the capability to pop that laser out immediately on target out to 15-25 yards.
This also frees your accessory rail to add a light, bayonet (they do exist!) or other item as you feel the need. These little do-dads are gunsmith-free, meaning as long as you can field strip your Glock, you can install it. Typical accuracy is 2-inches MOA, which is fine for point shooting which is what a laser is designed for.
About the only cautionary tale we can find is that they sometimes have a slight wiggle to them, cannot be adjusted, run on batteries (keep up with that), and don't work very well in bright sunlight. But hey, nothing is perfect.
They make these to fit GLOCK models 17, 17L, 17 Gen4, 18, 19, 19 Gen4, 20, 20SF, 21, 21SF, 22, 22 Gen4, 23, 24, 31, 32, 34, 35, 37, and 38. So if you are looking for the laser life without the laser bulk, one of these may be in your future.