Trijicon HD Night Sights Glock 21 Yellow Outline Front & Rear
Trijicon
$138.69
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Trijicon
Trijicon HD Night Sights Glock 21 Yellow Outline Front & Rear
The Trijicon HD Night Sights for Glock 21 with Yellow Outline Front deliver a battle-proven aiming solution trusted by law enforcement and competitive shooters who demand performance in every lighting condition.
- Tritium-powered night sights glow instantly in complete darkness with no activation required
- Bold yellow front outline ring accelerates target acquisition in daylight and low light
- HD (High Definition) sight picture aligns faster than standard three-dot configurations
- Hardened steel construction withstands heavy recoil and harsh cleaning solvents
- Evenly distributed tritium light output ensures a consistent, repeatable sight picture
- Drop-in fit designed specifically for the Glock 21 — no gunsmithing required
Who This Is For
These sights are built for Glock 21 owners who carry or compete seriously — from law enforcement officers who need split-second target acquisition on duty to home defenders and IDPA/USPSA shooters who refuse to compromise on low-light performance. If you're still running factory plastic sights, this is one of the highest-impact upgrades you can make to your pistol.
Specifications
| Brand | Trijicon |
|---|---|
| Model | HD Night Sights – Glock 21 |
| SKU / Part Number | GL104-C-600545 |
| Compatible Firearm | Glock 21 (.45 ACP) |
| Front Sight | Tritium with Yellow Outline Ring |
| Rear Sight | Tritium Two-Dot, Black Serrated |
| Sight Configuration | Three-Dot HD (High Definition) |
| Illumination | Self-Luminous Tritium (No Batteries) |
| Construction | Hardened Steel Body |
| Installation | Drop-In Replacement |
| Warranty | Limited Lifetime Warranty |
Frequently Asked Questions
Will these sights fit my Glock 21 Gen 3, Gen 4, or Gen 5?
Yes — Trijicon HD Night Sights in the GL104 configuration are designed to fit the Glock 21 across Gen 3 and Gen 4 frames. If you own a Gen 5 Glock 21, verify the part number against Trijicon's compatibility chart or contact us at Goodland Guns before purchasing, as Gen 5 models may require a slightly different SKU due to updated sight cuts.
What is the advantage of the yellow front outline over a standard white ring?
The bold yellow outline provides significantly higher contrast against most real-world backgrounds — particularly in transitional lighting such as dawn, dusk, or indoor environments. Your eye is naturally drawn to the brighter, more distinct color, allowing you to acquire the front sight faster under stress. This is one of the primary reasons the HD series is favored by defensive shooters and law enforcement over conventional white-dot configurations.
How long do the tritium vials last, and do the sights need to be recharged?
Tritium is a self-luminous radioactive gas that requires no batteries, charging, or exposure to light to glow. Trijicon's tritium vials have a rated useful life of approximately 12 years, after which the glow gradually dims but does not disappear entirely. These sights will continue to function as standard iron sights indefinitely — the tritium simply provides the added low-light advantage during its rated service life.
