Fn 509 Midsize Mini Red Dot 9mm Luger 4 inch 15+1 Flat Dark Earth

The FN 509 Midsize MRD is a compact member of the FN 509 series built to bridge duty-grade reliability and everyday carry practicality, featuring a 4" barrel, optic-ready serrated slide and a midsize frame in Flat Dark Earth that balances concealability with shootability. The pistol's optics mounting package and co-witness iron sights let you run a red dot for faster target acquisition at the range or in defensive scenarios while retaining a back-up sighting option; the new flatter-faced trigger produces a more controllable press and cleaner break for follow-up shots, and the improved controls and aggressive texturing on interchangeable FDE backstraps help manage recoil and hand placement under stress. Chambered in 9mm Luger with a 15+1 capacity and compatible with larger FN 509 magazines using a sleeve, this DAO design omits an external manual safety for a simplified manual of arms suited to trained shooters and duty users. Whether you're looking for a service-capable sidearm, a modern concealed-carry choice, or a versatile range gun, the FN 509 Midsize MRD delivers durability, adaptable ergonomics, and optics-ready performance; FFL transfer is required for purchase.