FN 509 Fullsize MRD 9mm

The FN 509 Fullsize MRD in 9mm is a duty-style, striker-fired pistol designed for personal or home defense, offering robust performance with its patented Low-Profile Optics-Mounting System for seamless red dot integration. This new-in-box double-action pistol features a 4.5-inch cold hammer-forged barrel with a 1:10" RH twist, a 17+1 capacity, and a recessed target crown to protect the rifling, ensuring long-term accuracy. Its full-sized slide and frame, finished in black, provide a secure grip and reduced recoil, complemented by a 4.5 to 6-pound trigger pull and a 6.3-inch sight radius for enhanced precision.

Built with FN’s proprietary machine gun-grade stainless steel, the 509 Fullsize MRD balances durability and manageability at 27 ounces, with an overall length of 7.9 inches and a height of 5.56 inches. It includes a Picatinny rail for accessories but does not come with additional magazines beyond the one 17-round magazine provided, nor does it include an optic, allowing users to customize as needed. The design prioritizes reliability and ergonomics, making it a versatile choice for defense-focused shooters.

As part of the FN 509 series, which spans Compact, Midsize, Standard, and Full-sized models, this pistol delivers the rugged reliability FN is known for in high-stakes scenarios. The added weight and length of the slide enhance stability, making it ideal for both novice and experienced shooters. Whether for home defense or range use, the FN 509 Fullsize MRD offers a dependable, optics-ready platform with the precision and durability to perform when it matters most.

Specifications