Xs R3d 2.0 For Glock 21 Sup Hght

The XS Sights R3D 2.0 for Glock 21 suppressor height sights are built for shooters who demand reliable target acquisition in any light condition. This second-generation night sight system pairs a dual-illuminated tritium front sight with a blacked-out serrated rear sight, giving you the contrast and brightness needed for fast, accurate shooting whether you're working in daylight or darkness. If you carry a suppressed Glock 21 or run one at the range, these suppressor-height sights clear your can and keep you on target.

The R3D 2.0 represents a real step up from earlier designs: the front sight glows with both tritium and photoluminescent fill, so you've got passive glow from the tritium and active daytime visibility from the high-contrast glow dot. The serrated rear sight is fully blackened to eliminate glare and keep focus downrange. Installation is notably easier than before—XS redesigned the sight for 50% less installation force, which means you can handle the job yourself without fighting the dovetail or gambling with a gunsmith's schedule.

Built to survive years of carry and training, these sights have a black nitride finish that resists corrosion and wear. Whether you're an EDC shooter, a suppressed-host enthusiast, or someone who simply wants reliable night sights on a full-size Glock, the R3D 2.0 delivers the performance without the hype.

Key Features

• Suppressor-height design—clears suppressors and can optics on your Glock 21
• Dual-illuminated front sight—tritium glow plus high-contrast photoluminescent dot for all-light shooting
• Blacked-out serrated rear sight—minimizes glare, drives focus downrange
• 50% easier installation—reduced dovetail force for DIY fitting
• Black nitride finish—durable, corrosion-resistant coating
• Purpose-built for Glock 21—ensures proper fit and function

Specifications

Frequently Asked Questions

Will these sights fit my suppressed Glock 21?

Yes. The R3D 2.0 is built to suppressor height, which means the sights sit tall enough to cowitness or clear suppressors and mounted optics on your Glock 21.

Can I install these myself, or do I need a gunsmith?

XS designed the R3D 2.0 with easier installation in mind—it requires 50% less dovetail force than the original R3D. Many shooters handle DIY installation, though a gunsmith is always an option if you prefer.

How do the night sights work in daylight?

The front sight combines tritium (which glows passively in darkness) with a high-contrast photoluminescent glow dot. In daylight, the bright glow dot and orange or green ring give you fast target acquisition; at night, tritium takes over. The blackened rear sight maintains contrast in both conditions.

What finish are these sights, and will they hold up to daily carry?

The R3D 2.0 features a black nitride finish designed to resist corrosion and wear through years of EDC use and training abuse.