Fn, 509 Midsize Miniature Red Dot, 9mm Luger, 4in, 15+1, Matte finish, Optic Ready

The FN 509 Midsize MRD from FN brings a carry-ready platform that balances concealability, shootability, and optic integration for everyday carry and duty use, featuring a 4" barrel, matte black midsize frame and a factory FN Low Profile Optics Mounting System that allows direct mounting of a range of miniature red dot sights to suit fast target acquisition in close quarters or defensive scenarios. With a 15+1 capacity and compatibility with higher-capacity FN 509 magazines using a sleeve, the 509 Midsize MRD retains the proven series ergonomics while improving controls and adding an updated, flatter-faced trigger for a more controllable press and cleaner break under stress. Textured interchangeable backstraps improve recoil management and hand fit for shooters of different sizes, while the optic-ready serrated slide and co-witness iron sight setup provide both modern red dot capability and reliable backup sighting. Chambered in 9mm Luger and operating as a double-action-only style striker-fired pistol, this model is useful for concealed carry, off-duty carry, and as a compact duty sidearm for those who need optic integration without machining an aftermarket slide. FFL transfer is required.