Hi-Viz FastDot H3 Iron Sights for Glock MOS 9mm/.40
Hi-Viz
$117.69
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Hi-Viz
Hi-Viz FastDot H3 Iron Sights for Glock MOS 9mm/.40
The HiViz FastDot H3 for Glock MOS 9/40 delivers a revolutionary tritium and fiber optic hybrid sight system that gives shooters a lightning-fast, high-visibility front sight picture in any lighting condition — from bright daylight to complete darkness.
- H3 tritium vial glows reliably in low-light and zero-light conditions
- Fiber optic pipe captures ambient light for blazing daytime visibility
- FastDot design accelerates target acquisition and natural eye alignment
- Precision-machined steel construction built to withstand hard daily use
- Drop-in fit specifically designed for Glock MOS 9mm and .40 S&W models
- Green front dot provides strong contrast against standard black rear sights
Who This Is For
The HiViz FastDot H3 is ideal for Glock MOS owners — including competitive shooters, law enforcement professionals, and serious concealed carriers — who demand a sight that performs equally well under harsh range lighting, dim indoor environments, and nighttime defensive scenarios. If you've been forced to choose between tritium and fiber optic, this hybrid sight ends that compromise entirely.
Specifications
| Brand | HiViz |
|---|---|
| Model | FastDot H3 |
| Part Number | GLMFD21 |
| Compatible Platforms | Glock MOS 9mm / .40 S&W |
| Sight Type | Front Sight — Tritium + Fiber Optic Hybrid |
| Light Technology | H3 Tritium Vial with Fiber Optic Pipe |
| Dot Color | Green |
| Housing Material | Steel |
| Installation | Drop-In Replacement (MOS Compatible) |
| Country of Origin | USA |
Frequently Asked Questions
Will the HiViz FastDot H3 work with my specific Glock MOS model?
The FastDot H3 (GLMFD21) is designed to fit Glock MOS pistols chambered in 9mm and .40 S&W. This includes popular models such as the Glock 17 MOS, 19 MOS, 22 MOS, and 23 MOS. Always verify your specific generation and model against HiViz's compatibility chart before ordering, as MOS frame variants can occasionally differ in sight dovetail dimensions.
How does the H3 tritium and fiber optic hybrid actually work?
The FastDot H3 combines two proven technologies in a single sight insert. The H3 tritium vial is a self-luminous radioactive element sealed in glass that glows continuously for 12+ years without batteries or external light sources — providing a usable sight picture in complete darkness. Wrapped around the tritium is a fiber optic pipe that gathers available ambient and artificial light during daytime use, producing an intensely bright dot that's significantly faster to acquire than traditional black post sights.
Do I need a gunsmith to install the FastDot H3 on my Glock MOS?
The FastDot H3 is engineered as a drop-in front sight replacement for compatible Glock MOS pistols. Many experienced shooters install it at home using a basic sight pusher tool or front sight tool and the appropriate Glock front sight screw bit. However, if you're not confident working on your firearm, we recommend having a qualified gunsmith perform the installation to ensure proper torque and alignment — especially on a carry gun.
