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The AmeriGlo GL121 is the sight set that made three-dot tritium the standard for a reason. It pairs a green tritium front dot with two yellow tritium rear dots, each wrapped in a bright white outline so your eye finds the front sight fast in daylight and locks onto it when the light drops off. That green-front, yellow-rear color split isn't just for looks either. The contrast between the two colors helps your eye separate the front dot from the rear at speed, which matters when you're focused on a target and not the sights.
This set is cut for the big-bore Glocks: models 20, 21, 29, 30, 31, 32, 36, 40, and 41 across Gen 1 through Gen 5. The rear sight uses a .150 inch notch and the front blade measures .140 inch wide, a combsquare-and-post setup that gives you a clean, no-guesswork picture. AmeriGlo machines these from US bar-stock steel, so they shrug off recoil and holster wear far better than the polymer sights that ship on a factory Glock.
The glow comes from Swiss-made tritium lamps, meaning the dots self-illuminate around the clock with no batteries, no charging, and no fiddling with a flashlight. Tritium fades gradually over many years rather than switching off, and AmeriGlo backs the lamps with a 12-year warranty, so you can count on that glow for the long haul.
The front sight screws on and the rear drops into the standard Glock dovetail, so no permanent modifications are needed. A rear sight pusher makes the job clean, and while plenty of owners install these at home with the right tools, a gunsmith can knock it out in a few minutes if you'd rather have it dialed in perfectly. Once they're on, you've got a rugged, low-light-ready sight picture that's trusted by law enforcement, military, and defensive carriers alike.
The GL121 is cut for AmeriGlo's large-frame Glock lineup, covering models 20, 21, 29, 30, 31, 32, 36, 40, and 41. It works across Glock Gen 1 through Gen 5 slides. Double-check your exact model before ordering, since the point of aim is height-regulated to these specific frames.
No. The illumination comes from Swiss-made tritium lamps that glow on their own, so there are no batteries to charge or replace. The white outlines around each dot handle daytime visibility while the tritium takes over in low light.
Tritium fades slowly over a span of years rather than cutting off all at once, and AmeriGlo warrants the lamps for 12 years. You'll get plenty of usable glow well before any noticeable dimming, which makes these a long-term upgrade over painted or fiber-only sights.
Yes, if you have the right tools. The front sight screws on and the rear drops into the standard Glock dovetail with a sight pusher, so no permanent modifications are needed. If you don't have a pusher or want them perfectly aligned, most gunsmiths can install them quickly.
| UPC | 644406900375 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | GL121 |
| Product Type | Tritium Front/Rear |
| Style | 3 Dot Night Sights Set Tritium |
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