FN 66100717 509 MRD Full-Size | 9mm | 17+1

The FN 509 MRD is a full-size, optics-ready service pistol from FN that is chambered in 9mm Luger and finished in matte Black PVD. It features a low-profile optics mounting system with included MRD plates, a polymer frame, and comes with two magazines and an FN soft case. The design emphasizes a full-size grip and slide geometry for stable handling during extended range sessions and duty-oriented use.

For an optic pairing under $1,000, the Holosun 507C is a compact red-dot that fits multiple footprints and pairs well with the MRD mounting options supplied with this pistol.

Recommended applications: duty/field use and competition or precision practice at the range.

Product Specifications

• The caliber is 9mm Luger.
• The operation type is listed as double-action striker-fired / semi-automatic.
• The magazine capacity is 17 rounds.
• The pistol ships with two 17-round magazines.
• The optic footprint is listed as multiple, and it includes MRD mounting plates.
• The frame material is polymer.
• The frame finish is Matte Black PVD.
• The series designation is MRD.
• The barrel material is steel.
• The barrel finish is black.
• The overall length is listed as 7.9 inches.
• The product ships with an FN soft case.
• The firearm includes a low-profile optics mounting system with adapter plates.
• The pistol includes interchangeable backstraps for grip customization.
• The UPC is 845737011703.

This FN 509 MRD Full-Size pistol offers a stable full-size platform with optics-ready flexibility for shooters who prioritize consistent sighting solutions and accessory compatibility. Its polymer frame and MRD mounting options make it a practical choice for extended range use and competitive formats where a full-size grip and slide improve control and follow-up speed.

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