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Questions & Answers
Will this site fit a 502 pistol Manufacturer Answer

Only if the FN 502 accepts the same sights as the FN 509. We would recommend reaching out to FN customer service to confirm.

by Night Fision, Manufacturer, November 26, 2025
Customer Reviews
Most Recent Reviews
Two thumbs up by Chip, Verified Owner, June 23, 2024
Absolutely the brightest tritium front sight that I’ve ever seen ! Not to mention the housing is very robust ! Great product !
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Product Info for Night Fision Tritium Front Sight for FN 509

Night Fision night sights offer a revolutionary new design that with brighter, more vivid, aiming dots. Like all night sights, Night Fision uses self-illuminating Tritium to get the "always on" glow that makes them so effective. Night Fision sights have 30% more Tritium than most sights on the market. The Tritium insert isnt surrounded by a painted-on ring, but rather one made of a daylight fluorescing material that produces optimum visibility in daylight.image

Night Fision sights provide maximum visibility in both nighttime AND daylight conditions, so when the pressure is on, youll locate your sights more quickly and get them on target - fast. A new mounting system holds the Tritium vial more securely to protect it from the ravages of unexpected knocks and dings.

Specifications for Night Fision Tritium Front Sight for FN 509:

Manufacturer: Night Fision
Gun Make: FN Herstal
Gun Model: FN 509
Color: Black
Sight Style: U-Notch
Fabric/Material: CNC Machined
Front Material: Fluorescent
Gun Type: Pistol
Size: One Size
Illumination Type: Tritium
Brightness Settings: 1
Finish: Black Nitride
Age Group: Adults
Gender: Unisex

Features of Night Fision Tritium Front Sight for FN 509

  • Brightest Tritium sights on the market
  • Front sight is brighter than rear, encouraging instinctive "Front Sight Focus" to keep your eyes on the target
  • Rugged machined steel sight bodies
  • Matte black Nitride finish - excellent wear- and corrosion-resistance
  • Variety of front dot colors and rear notch configurations to choose from
  • Industry leading 16-year brightness guarantee

Package Contents:

  • Night Fision Tritium Front Sight for FN 509
  • Allen Wrench

Night Fision Tritium Front Sight for FN 509 Orderable Models

List of Orderable Models

  • Night Fision Tritium Front Sight for FN 509 w/ Yellow Ring, Black, One Size, FN-100-001-YGXX , MPN: FN-100-001-YGXX , UPC: 810116036530 , Code: 32J-AP-TF50-FN-100-001-YGXX
  • Night Fision Tritium Front Sight for FN 509 w/ Orange Ring, Black, One Size, FN-100-001-OGXX , MPN: FN-100-001-OGXX , UPC: 810116036523 , Code: 32J-AP-TF50-FN-100-001-OGXX
  • Night Fision Tritium Front Sight for FN 509 w/ White Ring, Black, One Size, FN-100-001-WGXX , MPN: FN-100-001-WGXX , UPC: 810116036516 , Code: 32J-AP-TF50-FN-100-001-WGXX
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Last updated 2026-10-01 UTC.