FN 509 Full-Size MRD 9mm FDE | 66100722

The FN 509 Full-Size MRD is an optics-ready, duty-style pistol from FN America / FN Herstal chambered in 9mm. It features a polymer frame in Flat Dark Earth, an FN-designed cold hammer-forged stainless barrel with a recessed target crown, and a low-profile optics mounting system supplied with multiple MRD plates. This configuration suits duty/service carry and range/practical shooting applications.

For optics, the gun’s MRD footprint and included adapter plates support most major pistol red dots; a Trijicon SRO is an example of a quality optic typically priced under $1,000 that pairs well with this platform. The MRD system and co-witness-capable iron sights give operators flexibility for sighting preferences and rapid target acquisition on the range or in professional use.

Product Specifications

• The UPC is 845737011697.
• The caliber is 9mm Luger.
• The operation is described as double-action striker-fired.
• The magazine capacity is 17 rounds.
• The pistol ships with two 17-round magazines.
• The frame material is polymer with a Flat Dark Earth finish.
• The finish color is Flat Dark Earth.
• The optic interface supports a multiple MRD footprint and includes four mounting plates.
• The slide and frame include a loaded chamber indicator and ambidextrous controls.
• The barrel is described as a cold hammer-forged stainless steel design with a recessed target crown.
• The firearm includes interchangeable backstraps (three supplied) to adjust grip fit.
• The overall length is listed as 7.9 inches.
• The gun ships with an FN logo soft case and standard accessories including an owner’s manual and locking device.

This FN 509 Full-Size MRD presents a robust, optics-ready platform for serious users who want a full-size handgun with modern controls and modular sighting options. Its polymer frame, modular optics mounting, and included accessories make it well-suited for extended range sessions, duty/service roles, or practical shooting matches where reliability and sighting flexibility are priorities.

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