Introducing the FN 509 MRD full-size pistol, enhancing the renowned FN 509 series with FN's patented Low-Profile Optics-Mounting System. Ideal for users seeking a robust, full-sized duty-style pistol for personal or home defense, this 9mm firearm features a 4.50 inches cold hammer-forged barrel crafted from FN's proprietary machine gun-grade stainless steel. The barrel includes FN's signature recessed target crown, ensuring long-term accuracy and performance. Designed with a full-sized slide and frame, the FN 509 MRD provides a secure grip and reduced recoil, thanks to its increased weight and extended slide length. The FN 509 series now encompasses Compact, Midsize, Standard and full-sized models, offering versatility and reliability across a range of applications.