XS Sights R3D 2.0 Night Sights for Glock 21 Suppressor Height Green
XS Sights
$138.37
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XS Sights
XS Sights R3D 2.0 Night Sights for Glock 21 Suppressor Height Green
The XS Sights R3D 2.0 Night Sights for the Glock 21 (Suppressor Height, Green Ring) deliver a second-generation upgrade engineered for faster target acquisition and reliable performance in any lighting condition — from bright daylight to pitch-black environments.
- Suppressor-height design fits standard and threaded-barrel Glock 21 setups seamlessly
- Dual-illuminated front sight combines tritium and photoluminescent technology for all-light visibility
- Green photoluminescent Glow Dot ring maximizes contrast for rapid front sight focus
- Anti-glare, serrated blacked-out rear sight eliminates distractions and drives focus downrange
- Black nitride surface finish resists corrosion and withstands years of everyday carry abuse
- DIY-rated installation requires 50% less force than previous-generation night sights
Who This Is For
These sights are ideal for Glock 21 owners who demand dependable low-light performance for everyday carry, home defense, or duty use. They're also a smart choice for suppressor-ready builds where standard-height sights would be obscured by a can, giving competitive shooters and serious concealed carriers alike a reliable, high-visibility aiming solution without sacrificing speed or accuracy.
Specifications
| Brand | XS Sights |
|---|---|
| Model | R3D 2.0 |
| Compatible Firearm | Glock 21 |
| Sight Height | Suppressor Height |
| Front Sight Color | Green Photoluminescent Ring |
| Front Sight Type | Dual-Illuminated Tritium Photoluminescent |
| Rear Sight Type | Anti-Glare Serrated Blacked-Out |
| Surface Finish | Black Nitride |
| Installation | DIY-Rated (50% Less Force Required) |
| Generation | 2nd Generation (R3D 2.0) |
| Intended Use | EDC, Home Defense, Duty, Suppressor-Ready Builds |
Frequently Asked Questions
Will these sights work with a suppressor or compensator on my Glock 21?
Yes — the R3D 2.0 Suppressor Height sights are specifically designed to provide a clear sight picture over most standard suppressors and compensators. The elevated sight height ensures the front and rear sights remain visible above the added bulk of a muzzle device, making them an excellent choice for any Glock 21 with a threaded barrel or muzzle attachment.
How long will the tritium illumination last on the R3D 2.0 sights?
Tritium is a mildly radioactive gas that naturally glows without any external power source or charging. Most tritium night sight vials have an effective half-life of approximately 12 years, meaning they'll retain roughly half their original brightness after that period. In real-world use, the tritium in XS Sights R3D 2.0 sights will remain visibly useful for 10–15 years of regular carry and use. The photoluminescent Glow Dot element can also be "charged" by exposure to light for additional brightness in low-light conditions.
Can I install the XS R3D 2.0 sights myself, or do I need a gunsmith?
XS Sights rates the R3D 2.0 as DIY-friendly, and the second-generation design requires 50% less installation force than its predecessor, reducing the risk of damage during a home install. That said, a basic sight pusher tool or sight installation block is strongly recommended for a clean, safe install. If you're not comfortable using a sight tool, a qualified gunsmith can fit them quickly and inexpensively.
