FN 509C MRD 9mm Pistol | 3.7″ FDE | FN 66100575

The FN 509C MRD is a compact, optics-ready variant of the FN 509 platform designed for everyday carry and duty-style applications where a smaller footprint is desired without sacrificing an optics-ready interface. This model ships in Flat Dark Earth with FN’s low-profile optics mounting system and co-witness-capable iron sights. It is chambered in 9mm and configured with a 3.7-inch barrel, offering a blend of controllability and concealability. A practical optic to pair with this pistol is the Holosun 507K, which fits the MRD footprint and remains well under $1,000.

Product Specifications

• The manufacturer is FN America / FN Herstal.
• The model is 509C.
• The manufacturer part number is FN 66100575.
• The UPC is 845737010928.
• The caliber is 9mm Luger.
• The barrel measures 3.7 inches.
• The barrel is Cold Hammer Forged with a recessed target crown.
• The frame is constructed of polymer.
• The frame finish/color is Flat Dark Earth.
• The slide is Flat Dark Earth optic-ready steel with serrations.
• The optic footprint is Multiple (FN Low-Profile Optics Mounting System).
• The sights are iron sights that co-witness with a mounted optic.
• The package includes two magazines.
• The overall length is 6.80 inches.
• The package includes a soft pistol case and owner’s manual.

The FN 509C MRD compacts the platform’s modularity into a carry-friendly footprint while retaining an optics-first slide and durable barrel construction. Its configuration supports everyday carry and range use where a compact, optics-ready pistol is preferred. The MRD mounting system simplifies adding a red dot that will co‑witness with the included iron sights and keeps the package focused on practical, dependable function.