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Running a red dot on your Glock is great right up until the battery dies or the glass fogs over. That is exactly the problem the AmeriGlo GL491 3XL set solves. These 3XL tall suppressor-height sights sit high enough to poke up into your optic window, giving you a co-witness with your dot and a dependable set of backup irons if the electronics ever quit on you.
The front sight is a green tritium lamp wrapped in a bright white outline, which makes it easy to pick up in daylight and keeps glowing when the sun goes down. AmeriGlo paired it with a flat black rear, and that combo is intentional. With no distracting dots or glow on the rear, your eye goes straight to that green front, and the sight picture stays clean whether you are lining up irons or letting the dot do the work.
On a pistol, the relationship between irons and a red dot is a little different than on a rifle. Stock Glock sights are simply too short to show through most optic windows, so if your dot goes dark you are left with nothing to aim with. At 3XL height, the GL491 front and rear are tall enough to project into the glass, so the irons are there when you need them. Whether you land closer to an absolute stack or a lower portion of the window depends on your specific optic and slide cut, but the point is the same: you always have a backup.
This set is built for Glock Gen 1 through 5 and MOS slides, covering the vast majority of the lineup. The front measures .365 inches and the rear runs .451 inches. It plays nicely with common footprints including the Holosun 407/507/508T, Trijicon RMR and SRO, and the EOTech EFLX. Installation uses the dovetail cuts like any Glock sight swap, so a sight pusher makes the job clean and painless. Once they are seated, zero them like you would any set of irons and you are good to go on the range or in a duty setup.
Yes, that is the whole idea behind these 3XL tall sights. They stand high enough to project up into most optic windows so you can see the irons alongside your dot. Exactly where the irons land in the window depends on your specific optic and slide cut, but you will have a usable backup either way.
This set is designed for Glock Gen 1 through 5 as well as MOS slides, which covers the great majority of models. Double check your particular slide since a few subcompacts like the 42 and 43 fall outside the fit. If you are running an optic-cut or MOS slide, you are in good shape.
The flat black rear is a deliberate design choice. Keeping the rear free of dots or glow means your eye is drawn straight to the green tritium front, which speeds up sight acquisition and keeps the picture clean. It is a popular setup for both range and defensive use.
These install into the standard Glock dovetail cuts, so a sight pusher tool makes the swap quick and clean without marring the slide. You can drift them with a punch, but a pusher gives you more control. Once seated, zero them like any set of irons.
| UPC | 644406910640 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | GL-491 |
| Color | Green, White Outline |
| Model | |
| Product Type | Sight |
| Shipping Weight | 0.07 |
| Style | Optic-Compatible |
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