The FN 509M Midsize MRD is a compact, optics-ready semi-automatic pistol designed for everyday carry and duty use. It features the FN Low Profile Optics Mounting System for direct mounting of compatible mini red-dot optics and a 4.0-inch cold hammer-forged barrel with recessed crown. The pistol pairs a Flat Dark Earth polymer frame with an optics-ready, serrated steel slide for a balanced, service-oriented package.
Key Specifications
- The caliber is 9mm Luger.
- The barrel measures 4.0 inches.
- The frame is constructed from polymer and finished in Flat Dark Earth.
- The slide is optics-ready with the FN Low Profile Optics Mounting System (multiple footprints supported).
- The barrel is cold hammer-forged and features a recessed target crown.
- The pistol includes two magazines.
- The weight is approximately 26.5 oz.
- Sights are provided as fixed / optics-ready backup sights.
- Controls are fully ambidextrous for right- or left-hand operation.
Purpose-built for practical carry and duty use, the FN 509M Midsize MRD balances a midsize frame and a 4.0-inch barrel with an optics-first slide configuration. Its combination of a durable polymer frame, cold hammer-forged barrel, and FN optics mounting system makes it suitable for shooters looking for a solid, service-oriented pistol that accepts miniature red-dot optics and includes two magazines right from the factory.
Product information is supplied by the manufacturer and/or distributor and may be automatically formatted or enhanced using AI for clarity and consistency. While we strive for accuracy, specifications, features, and included items may change without notice. Always verify details using the manufacturer’s official documentation and the information shown on this product page before purchase or use.
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