The FN 509 Full Size MRD NMS is a 9mm semi-automatic pistol built around FN's duty-proven 509 platform. Its full-size frame, 4.5-inch barrel, and 10+1 capacity provide a practical balance of shootability and controlled handling. The Low Profile Optics Mounting System includes adapter plates for direct installation of many major pistol red dot optics, while the all-black co-witness iron sights provide a dependable aiming solution. A polymer grip frame and internal trigger safety complete the straightforward no-manual-safety configuration.

Key features

• Full-size 9mm platform with a 4.5-inch barrel for stable handling and a longer sight radius
• 10+1 capacity configuration supplied with 10-round magazines
• FN Low Profile Optics Mounting System with adapter plates for compatible pistol red dot optics
• All-black co-witness iron sights provide a clear backup aiming system
• Polymer grip frame supports a durable, manageable carry weight
• Internal trigger safety with no manual safety for a consistent, streamlined operation

The FN 509 Full Size MRD NMS combines duty-focused ergonomics, optics compatibility, and dependable iron sights in a full-size 9mm pistol.