FN 509 9mm

Updated August 24, 2026

This FN 509 semi-automatic pistol is chambered in 9mm and features an attractive FDE-colored configuration along with several desirable factory-style features. Serial number GKS0241957, this example features an approximately 4.25" threaded barrel with a shiny bore and presents in very good overall condition. The pistol utilizes a durable polymer frame with an aggressively textured synthetic grip paired with a steel slide. The slide is optic-cut, allowing the next owner to mount a compatible electronic sight, while the threaded barrel adds additional versatility. One magazine is included. FN developed the 509 from its military handgun competition experience, and the platform has since become one of the company’s most recognizable modern striker-fired pistols. The FDE finish gives this example a distinctive military-inspired appearance and sets it apart from the more common black configuration. With its optic-ready slide, threaded barrel, very good condition, and respected FN pedigree, this is a well-equipped modern handgun package. Please see photos. FN 509 9mm Semi 4.25 Shiny GKS0241957 Very Good

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