Meprolight USA FT Bullseye Rear Sight - Black with Red Tritium/Fiber Optic (631053408)

The Meprolight USA FT Bullseye Rear Sight is a dual-illumination pistol sight built for shooters who want reliability in any light. This black rear sight combines red tritium and fiber optic elements, giving you a glowing front post in low light and a bright, fast-acquisition target in daylight—no batteries required for the tritium, and no fidgeting with brightness settings. It's designed to work with Glock MOS (Modular Optic System) platforms, making it a smart choice if you're running a suppressor-height setup or pairing it with a reflex sight on your carry or duty gun.

Meprolight sights are purpose-built for serious shooters. The bullseye design keeps your sight picture clean and uncluttered, letting you focus on the target. The combination of self-illuminating tritium and light-gathering fiber optic means you get a visible aiming point whether you're in pitch darkness or bright midday sun—a real advantage over single-mode sights. For concealed carry, competition, or professional use, this sight removes the guesswork from low-light engagement.

Installation is straightforward on any MOS-compatible Glock. The sight integrates seamlessly with factory optics cuts, so you can layer your setup without compromises. If you're building a versatile defensive pistol or want backup sights that actually work when you need them, this is a no-nonsense option from a brand trusted by military and law enforcement.

Key Features

• Dual-illumination design: red tritium for no-light situations, fiber optic for daylight speed
• Fits Glock MOS pistols for modular optic platform compatibility
• Bullseye rear aperture for clean, focused sight picture
• Durable black anodized finish
• Self-illuminating tritium requires no batteries or power

Frequently Asked Questions

Will this rear sight work with any Glock, or only MOS models?

The Meprolight FT Bullseye Rear Sight is designed specifically for Glock MOS platforms. MOS stands for Modular Optic System—a factory cut on certain Glock models (like the G17 MOS, G19 MOS, and similar variants) that allows mounting of aftermarket optics. Standard Glock slides without the MOS cut will not accommodate this sight without modification.

Can I pair this with a reflex sight or red dot on the same pistol?

Yes. Because the MOS cut is designed to accept both a rear sight and an optic mounted forward on the slide, you can use this Meprolight sight as a backup or co-witness with a compatible reflex sight. This redundancy is popular with serious defensive and duty shooters.

How long does the tritium stay bright?

Tritium is a radioactive isotope with a half-life of approximately 12 years, meaning it will remain visible (though gradually dimming) for decades. The fiber optic element supplements the tritium in daylight and remains bright indefinitely.

What's included in the box?

The product listing does not specify what accessories or installation tools are included. Contact Bosque Outdoors for details on what comes with your sight.