Apex Optic Mount for Holosun 509T to FN MRD Pistols

Description

If you’ve been looking for a clean, reliable way to mount a Holosun 509T on your FN 509 pistol, this Apex Optic Mount delivers exactly what you need. Designed specifically for the FN Low Profile Optics Mounting System™, it eliminates the hassle of stacking plates and extra adapters. At just $60, it’s a straightforward upgrade that gets your red dot locked on tight without unnecessary bulk.

Machined from a solid billet of steel and finished with a black oxide coating, this mount is built to handle the recoil of daily carry, range sessions, and hunting trips. The integrated locking key mounts directly to your FN 509 slide — no MRD Insert required. That means fewer parts to lose, less height over bore, and a lower profile that keeps your setup streamlined. Whether you’re running a full-size 509, a compact model, or the FN 545, this mount fits the factory slide pattern without modification.

Key benefits for your carry or competition setup:

• Direct slide mount: Attaches straight to the FN Low Profile Optics Mounting System™ — no stacking plates, no extra inserts, no guesswork.
• Steel construction: Billet steel with black oxide finish stands up to thousands of rounds and harsh weather without rust or loosening.
• Secure optic fit: Holds the Holosun 509T firmly in place, maintaining zero through heavy use and holster wear.
• Low profile design: Keeps the optic close to the slide for better co-witness with factory iron sights and easier concealment.
• Compatible with FN 509 and FN 545: Works with all models using the FN Low Profile Optics Mounting System™ — check your slide for the specific footprint.

Specs you can count on:

• Material: Billet steel, black oxide finish
• Compatible optics: Holosun 509T (all versions)
• Fitment: FN 509 series (full-size, compact, and tactical) and FN 545 with factory low profile mounting system
• Installation: Direct mount to slide — no MRD insert, no adapter plates
• Price: $60

This mount is for the shooter who wants a reliable, no-nonsense solution for running a Holosun 509T on their FN pistol. If you carry every day, hunt with a sidearm, or shoot for practical accuracy, you’ll appreciate the simplicity and