The FN 509 Fullsize MRD is the ultimate full-sized pistol designed for those seeking top-tier performance in personal or home defense. Chambered in 9mm, this striker-fired pistol boasts a 4.5" cold hammer-forged barrel crafted from machine gun-grade stainless steel for exceptional durability and accuracy. Featuring FN's Low Profile Optics-Mounting System, it offers the versatility to mount a wide range of miniature red dot optics directly onto the slide, making it ideal for both tactical and recreational use. The full-sized frame and slide provide superior recoil management, ensuring faster follow-up shots, while the recessed target crown and polished feed ramp enhance long-term performance and accuracy. With co-witness iron sights and the added flexibility of four MRD mounting plates, the FN 509 Fullsize MRD is a reliable choice for shooters who demand precision and versatility. Built with ergonomics and functionality in mind, the FN 509 Fullsize MRD features enhanced grip texture for a secure hold in all conditions, offering a more controlled shooting experience. The ambidextrous slide stop lever and magazine release ensure ease of use for both left- and right-handed shooters. Designed for ease of manipulation, the aggressive slide serrations provide positive handling, while the MIL-STD-1913 accessory mounting rail allows for the addition of lights or lasers for enhanced versatility. The 17-round magazine capacity offers ample firepower, and the included three interchangeable backstraps ensure a custom fit for comfort and control. Whether you're looking for a duty-ready pistol or a home defense solution, the FN 509 Fullsize MRD combines performance, durability, and adaptability in one powerful package.