Apex Optic Mount for RMSc/507K – FN 509

Description

The Apex Optic Mount delivers a direct-fit solution for mounting the Shield Sights RMSc or Holosun 507K to your FN 509 pistol. Designed specifically for slides using the FN Low Profile Optics Mounting System™, this mount replaces the need for adapter plates or aftermarket slide milling. The result is a lower, more secure optic installation that co-witnesses with standard-height iron sights on most FN 509 MRD models.

Machined from a single billet of steel and finished in Black oxide, this mount holds up to the harsh conditions of the Arizona desert. High dust, extreme heat, and suppressor use won’t compromise the fit or zero. The steel construction resists deformation better than aluminum options, keeping your optic locked in place under heavy recoil and sustained fire.

Key benefits for your setup:

• Direct fit for FN Low Profile Optics Mounting System™ — No extra plates, no modification to your slide. Drops in and torques down.
• Designed for Shield Sights RMSc and Holosun 507K — Two of the most popular compact optics for concealed carry and duty use.
• Steel construction — Billet steel with Black oxide finish handles high round counts, suppressor blowback, and repeated cleaning without wearing out.
• Heat and dust tolerant — Black oxide finish resists corrosion and fouling. Steel threads hold up better than aluminum when cleaning carbon and dust buildup.
• Suppressor-friendly — Lower optic height keeps your sight picture clear when running a suppressor. Works with standard-height sights on FN 509 Tactical and MRD models.

Specs and fitment:

• Compatibility: FN 509 models with FN Low Profile Optics Mounting System™ slide cut (Tactical, MRD, Compact MRD).
• Optic compatibility: Shield Sights RMSc, Holosun 507K (also fits 407K, EPS Carry with same footprint).
• Hardware: For RMSc optics, use the “514” screws included with your FN 509 Tactical or MRD pistol. For Holosun 507K, use the screws provided with the mount.
• Material: Billet steel, Black oxide finish.
• Price: $65

This mount is built for shooters who need reliable optic retention in demanding environments. No sh