The FN 509 Midsize MRD is a purpose-built defensive handgun engineered to combine concealability, capacity, and modern optics integration in a duty-grade package. Constructed around a durable polymer frame and striker-fired operating system, this pistol features FN's Low Profile Optics Mounting System, allowing direct mounting of numerous miniature red dot optics. The black-finished slide and frame are complemented by enhanced grip texturing, interchangeable backstraps, and a flatter-faced trigger designed to deliver improved control and consistency under demanding conditions. Designed for everyday carry, home defense, and professional use, the FN 509 Midsize MRD offers excellent shootability in a compact package while maintaining a full 15-round capacity. The included Leupold DeltaPoint Pro 2.5 MOA red dot pairs with suppressor-height co-witness iron sights for rapid target acquisition and dependable backup aiming capability. Improved controls, customizable ergonomics, and compatibility with higher-capacity FN 509 magazines make this pistol a versatile choice for shooters seeking proven performance and modern optics readiness. FEATURES Optics Ready Design FN Low Profile Optics Mounting System supports direct mounting of numerous popular red dot optics. Leupold DeltaPoint Pro Included Factory-equipped 2.5 MOA red dot provides fast target acquisition and enhanced accuracy. Co-Witness Iron Sights Suppressor-height sights remain visible through the optic for backup aiming capability. Enhanced Trigger Design Flatter-faced trigger promotes a cleaner break and more consistent trigger press. Interchangeable Backstraps Allows shooters to customize grip fit and improve overall control. Aggressive Grip Texture Improved texturing enhances recoil management and weapon retention. 15-Round Capacity Balances concealed carry dimensions with service-pistol firepower. FN 509 Magazine Compatibility Accepts larger-capacity FN 509 magazines when used with appropriate sleeves. SPECIFICATIONS Manufacturer: FN America Model: 509 Midsize MRD Caliber: 9mm Luger Capacity: 15+1 Barrel Length: 4" Thread Pattern: Not specified Grip: Black Polymer with Interchangeable Backstraps Stock: Not specified Trigger: Flat-Faced Striker-Fired Trigger Sights: Co-Witness Iron Sights with Leupold DeltaPoint Pro 2.5 MOA Red Dot Finish: Black Magazine Included: 4 NOTES The Midsize configuration strikes an excellent balance between concealability and shootability for everyday carry. Factory-installed DeltaPoint Pro eliminates the cost and setup time of adding an optic later. Co-witness sights provide redundancy should the optic become obstructed or lose power. Compatible with larger FN 509 magazines, giving users flexibility between carry and range configurations. FN's optic mounting system is one of the most secure and user-friendly factory red-dot interfaces available. A strong choice for shooters wanting a duty-grade concealed carry pistol with a ready-to-use red dot setup. This item may have signs of previous use, such as minor dents or dings. We cannot guarantee that all original components are included. Please review the photos provided for a detailed view of the item's condition.