The FN 509 Midsize MRD is a striker-fired 9mm pistol designed to balance service-ready performance with a more compact carry profile. Its 4-inch cold hammer forged stainless steel barrel supports durability and consistent accuracy, while the shortened grip improves concealability without reducing the standard 15+1 capacity. The FN Optics Mount System allows compatible red dot sights to be installed, and interchangeable backstraps help tailor the grip to the shooter's hand. Standard fixed sights provide a dependable aiming reference when no optic is mounted.

Key features

• MRD optics-ready slide accepts compatible red dot sights through the FN Optics Mount System
• 4-inch cold hammer forged stainless steel barrel provides durable, consistent performance
• 15+1 capacity offers substantial on-board ammunition capacity
• Shortened midsize grip supports improved concealability and handling
• Interchangeable backstraps allow the grip fit to be customized
• Integrated trigger safety and striker-fired operation support safe handling and fast deployment

The FN 509 Midsize MRD delivers optics-ready capability, practical capacity, and a carry-friendly profile in a dependable service-style pistol.