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LaserLyte Rear Sight Laser for Glock Review - RSL Glock - RTB-GL

About.com Rating 4.5 Star Rating


The Bottom Line

This sight is pretty nice. It basically provides the benefits of something like LaserGrips, but mounted much closer to the gun's bore and line of sight - and without having to change grips on a pistol that doesn't even take grips. And unlike guide rod lasers, it doesn't require you to change internal parts.

It replaces the gun's rear sight, and serves as a rear iron sight, but with the push of a button it also shines a laser downrange, providing a red dot as an aiming point.


  • Made in USA.
  • Came with two sets of batteries (but some of the spares corroded and turned to crud after a while).
  • Compact and light; doesn't add bulk to the gun.
  • Allows the pistol to be used in most holsters.
  • Instructions are clear - and are printed in large bold print, easy to read.
  • Installation was easy.
  • Includes a brass drift punch to use in removing the old sight and installing this one.
  • No need to replace internal parts or grips (Glocks don't have replaceable grips, after all).
LaserLyte Rear Sight Laser for Glocks

LaserLyte RTB-GL rear sight laser for Glocks. The arrow indicates the pushbutton switch. (Click the image for a larger view.)

Photo courtesy of LaserLyte

  • Spare batteries corroded and are useless a year after I received the sight.
  • Not easy to see in daylight.
  • Installing batteries can be tricky.

  • Model RTB-GL
  • Replaces rear sight and acts as rear sight, plus has a red laser built in.
  • Takes four batteries (377 according to LaserLyte, but the provides spares are marked LR626).
  • Batteries should last 5 hours constant/10 hours pulse.
  • Fits all GLOCK® pistols.
  • 650nm laser module; Class IIIA, 5mw; specified range at night 500 yards.
  • Weighs just 1.2 ounces.
  • Dimensions: 1.05" wide x 0.90" long x 0.30" high (from top of slide to highest point).
  • Includes a brass punch for removing the rear sight and installing this one, plus two hex wrenches.
It's a Sight to See

When I received the LaserLyte RTB-GL rear sight laser for Glocks, I was pleased to note a couple of things; it was made in USA, and it came with four batteries in it plus a set of four spares.

Sadly, a year later three of the unused spares had corroded and were thus useless.

I installed the RTB-GL on a Glock 36 a few days later, and that went smoothly. I appreciated the good illustrated instructions provided in the package, which were printed large and bold enough to easily read and follow. I was also glad that it included a brass punch for drifting the rear sight out of the dovetail slot in the rear of the slide, and drifting this one in.

It works fine as an iron sight, offering the same clearly-defined white U-shaped outline found on the Glock's factory sight.

It's tough to get the tiny batteries into the sight without having them flip over. Install them one at a time and make sure they're right; if one gets flipped the sight still works sometimes, but the dot is very weak. A reversed battery will probably also lead to problems greater than a weak dot.


Before adjusting the laser, be sure to adjust the iron sights by drifting the rear sight to the right or left. Once you have it shooting where you want it, you can then dial in the laser using the instructions provided by LaserLyte.

Adjusting the laser to match the sights was easily done - and it almost felt too easy. What I mean is that the screws which you turn to adjust the laser turned very easily, making me question whether they would stay in place after being adjusted. After use, though, it appears that they stayed just fine.

The Switch

One off-putting thing was that sometimes the switch - which is a pushbutton on the rear of the left side of the sight - will click, but not turn on the laser. I haven't found a reason or explanation, but sometimes it will work, and sometimes it won't. Most of the time, it worked fine for me as long as I pushed the button firmly.

Closer to the Bore

I appreciate that the laser on this product is much closer to the gun's bore, and therefore can be more accurate across a greater range of distance than lasers mounted below the bore (as in guide rods) or below the bore and off to one side (as in Lasergrips).


I can recommend this product, but I think it would be a good idea for users to get some good name brand batteries for it, as well as a set of good-quality spares. The fact that my spares corroded when they aren't even being used is a red flag, and if batteries corroded inside this sight it would be very difficult to remove them.

It's a good product, a great idea, and puts the laser close to your bore and line of sight. Installation was easy, and using it is a piece of cake.

- Russ Chastain

Disclosure: A review sample was provided by the manufacturer. For more information, please see our Ethics Policy.
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