Night Fision Sight Set Yellow Front Square Notch Rear For Fn 509

Night Fision's yellow front sight and square notch rear sight set gives your FN 509 a combat-proven night sight solution engineered for serious shooters. These sights use Swiss-made tritium that glows consistently in low light without batteries or external power, making them ideal for defensive carry, home protection, or tactical training where reliable target acquisition matters. Night Fision's design carries more tritium per vial than typical night sights on the market, paired with a domed lens that focuses the glow into a sharp, defined sight picture rather than a dim haze.

Built from CNC-machined steel and treated with black nitride coating, these sights handle hard use and resist corrosion from daily carry or training abuse. The injection-molded sleeve design locks the tritium vials firmly in place so they won't shift or rattle under recoil. The yellow front sight contrasts well against most backgrounds in daylight while the tritium core takes over when the sun goes down—a smart two-mode approach that keeps your sight picture fast across conditions. Installation is straightforward enough for a gunsmith, though some experienced shooters handle the swap themselves.

Whether you're upgrading from factory plastic sights or replacing worn tritium, this Night Fision set gives your FN 509 the low-light capability that defensive shooters expect and the durability that outranks mall-grade alternatives. Made in the USA with international tritium quality, these sights earn their reputation among people who trust their carry gun in the dark.

Key Features

• High-tritium vials produce a brighter glow than standard night sights
• Domed lens collimates light rays for a crisp, defined sight picture
• Yellow front sight for enhanced daytime visibility and contrast
• Square notch rear sight for classic, reliable geometry
• Black nitride steel resists corrosion and wear
• Injection-molded design locks vials securely in place
• FN 509-specific cut for direct fitment

Specifications

Frequently Asked Questions

Will these Night Fision sights fit my FN 509?

Yes—this is a dedicated sight set cut specifically for the FN 509 platform.

How bright are these night sights compared to other brands?

Night Fision sights carry more tritium per vial than average night sights on the market, and the domed lens design focuses that glow into a sharper, more defined sight picture. That combination delivers noticeably better low-light visibility than thinner or flat-lens designs.

Do I need a gunsmith to install these sights?

Gunsmith installation is recommended. While experienced shooters can perform the swap themselves, professional installation ensures proper fit and function.

Will the yellow front sight glow at night like the rear?

The front sight has a yellow component for daytime contrast and visibility. The tritium element within glows in low light, but the primary benefit of the yellow front is daytime aiming clarity—the rear sight with its tritium vial handles the night glow.