FN 509 Midsize MRD 9mm Optics-Ready Pistol

FN 509 Midsize MRD: Modern Concealed Carry Excellence

The FN 509 Midsize MRD represents a significant evolution in practical defensive handgun design. This mid-sized frame pistol combines genuine concealability with the modern advantage of direct red dot optic mounting—a feature that was once reserved for full-size duty weapons.

Optics-Ready Design

The FN Low Profile Optics Mounting System allows you to mount more than 10 different miniature red dot optics directly to the slide. This is not a compromise solution; it is a genuine, low-profile mounting system that maintains the pistol's concealability while giving you the speed and accuracy advantages of a red dot sight.

Ergonomic Excellence

Ambidextrous Controls — Magazine release, safety levers, and slide stop function equally well for left and right-handed shooters.

Improved Trigger — The flat-faced trigger design promotes a more controlled press and cleaner break, essential for precision shooting under stress.

Enhanced Backstraps — Two included backstraps with improved texturing provide better recoil management and allow you to customize the grip to your hand size.

Mechanical Specifications

• Barrel: 4-inch cold hammer-forged stainless steel with recessed target crown
• Slide: Serrated steel with Flat Dark Earth PVD finish
• Frame: Flat Dark Earth polymer with MIL-STD-1913 accessory rail
• Sights: Combat-style fixed sights
• Capacity: 15 rounds (two magazines included)
• Cocking Serrations: Improved front and rear serrations for reliable slide manipulation

What's Included

Each FN 509 Midsize MRD ships with two 15-round magazines, a protective case, locking device, and complete owner's manual. The pistol is also compatible with larger-capacity FN 509 magazines when used with an appropriate sleeve.

This is a serious tool for serious shooters who demand both concealment and modern performance.