FN 509 FS MRD 9mm Pistol with Optics Mount

FN 509 FS MRD: A Modern Duty Pistol Built for Optics

The FN 509 FS MRD represents a thoughtful evolution in full-size defensive pistol design. This is a serious tool for those who demand reliability, accuracy, and the flexibility to mount modern optics.

Key Features

• Optics-Ready Design: Patented Low Profile Optics Mounting System with four interchangeable mounting plates accommodates popular red dot sights
• Proven Barrel: 4.5" cold hammer-forged barrel with recessed target crown protects rifling and maintains accuracy over the pistol's service life
• Ergonomic Control: Three interchangeable backstraps ensure proper fit for different hand sizes
• Reliable Action: Double-action striker-fired mechanism with 4.5 to 6.0 pound trigger pull
• Substantial Capacity: Two 17-round magazines provide ample ammunition for defensive scenarios

Specifications

• Caliber: 9mm Luger
• Barrel Length: 4.5 inches
• Overall Length: 7.9 inches
• Height: 5.56 inches
• Width: 1.35 inches
• Weight: 27 ounces
• Sight Radius: 6.3 inches
• Twist Rate: 1 in 10 inches (right-hand)
• Magazine Capacity: 17 rounds

What's Included

FN provides everything needed to get started: soft carrying case, two 17-round magazines, three interchangeable backstraps, four MRD mounting plates, owner's manual, and gun lock.

The FN 509 FS MRD is built for shooters who want a full-size platform with modern optics capability—whether for personal defense, home protection, or sport shooting.