The FN 509 MRD is a full-size 9mm semi-automatic pistol built around FN's modular optics-ready design. It features a 4.5-inch barrel, a 17+1 capacity, a striker-fired action, and a manual safety. The FDE/Tan finish pairs with a textured polymer frame for a secure, adaptable grip, while factory night sights provide a visible aiming reference in low-light conditions. Its MRD mounting system allows the pistol to accept compatible miniature red-dot optics without requiring a custom slide cut.

Key features

• Optics-ready MRD slide supports compatible miniature red-dot sights
• 4.5-inch barrel balances service-pistol handling with sight radius
• 17+1 capacity provides substantial onboard ammunition
• Striker-fired action with integrated trigger safety and manual safety
• Factory night sights support aiming in changing light conditions
• Textured polymer grip frame includes interchangeable backstrap options for fit adjustment

The FN 509 MRD combines duty-oriented capacity, adaptable ergonomics, and factory optics compatibility in a dependable full-size pistol.