XS Sights R3D 2.0 Night Sights for Glock 21 Orange Front
XS Sights
$128.12
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XS Sights
XS Sights R3D 2.0 Night Sights for Glock 21 Orange Front
The XS Sights R3D 2.0 Night Sights for Glock 21 deliver a significant upgrade over standard factory sights, combining cutting-edge dual-illuminated tritium photoluminescent technology with a rugged, competition-ready design built for everyday carry and self-defense use.
- Dual-illuminated front sight pairs tritium with a photoluminescent orange ring for all-light visibility
- High-contrast orange Glow Dot draws the eye instantly for fast, accurate target acquisition
- Anti-glare blacked-out serrated rear sight eliminates distraction and drives focus downrange
- Black nitride surface finish resists corrosion and withstands years of hard EDC use
- DIY-rated installation requires 50% less force than previous generation sights
- Rear sight ledge enables reliable one-handed slide manipulation in high-stress situations
Who This Is For
The XS R3D 2.0 is ideal for Glock 21 owners who demand dependable low-light performance from a concealed carry or home defense pistol. Whether you're a first-time sight upgrader tackling a DIY install or an experienced shooter looking for the brightest, most durable notch-and-post setup available, these sights deliver the speed and confidence you need when every second counts.
Specifications
| Brand | XS Sights |
|---|---|
| Model | R3D 2.0 |
| Compatible Firearm | Glock 21 |
| Front Sight | Dual-Illuminated Tritium Photoluminescent |
| Front Sight Ring Color | Orange |
| Rear Sight | Anti-Glare Blacked-Out Serrated |
| Surface Finish | Black Nitride |
| Sight Type | Notch and Post (Iron Sights) |
| Installation | DIY-Rated, 50% Less Force Required |
| Special Feature | Rear Ledge for One-Handed Slide Rack |
| Generation | 2nd Generation (2.0) |
Frequently Asked Questions
Will the XS R3D 2.0 fit my specific Glock 21 variant?
The XS R3D 2.0 is designed specifically for the Glock 21, which includes the standard Gen 3 and Gen 4 full-size models chambered in .45 ACP. If you own a Glock 21SF or a variant with a modified slide profile, we recommend confirming compatibility with XS Sights directly before purchasing. Always verify your Glock's generation and slide cut dimensions to ensure a proper fit.
Can I install these sights at home without a gunsmith?
Yes — the R3D 2.0 is rated for DIY installation and requires 50% less insertion force compared to the first-generation R3D sights. Most users can complete the install with a quality sight pusher tool or a sight installation block and a mallet. A basic Glock armorer's tool kit is recommended for best results. No gunsmithing experience is required, though having a professional install the sights is always a valid option if you prefer it.
How long will the tritium illumination last, and how bright are these sights in total darkness?
Tritium-powered sights like the R3D 2.0 have a radioactive half-life of approximately 12 years, meaning the glow will remain functional for well over a decade before noticeable dimming occurs. The dual-illuminated design combines tritium with a photoluminescent orange ring — when charged by ambient light or a flashlight, the photoluminescent material provides an exceptionally bright glow that significantly outperforms tritium-only sights in low-light and no-light conditions. This makes the R3D 2.0 one of the brightest night sight options currently available for the Glock 21.
