Gun Review: FN 509 Compact MRD FDE

U.S. Precision Defense When the U.S. Army released a Request for Proposal looking for a new firearm to replace Beretta’s M9, a new family of handguns was developed...

Gun Review: FN 509 Compact MRD FDE
12June
Gun Review: FN 509 Compact MRD FDE
12June

Gun Review: FN 509 Compact MRD FDE

Written by Guest Contributor
in Section Gun Reviews

U.S. Precision Defense

When the U.S. Army released a Request for Proposal looking for a new firearm to replace Beretta’s M9, a new family of handguns was developed at Fabrique Nationale—the Model 509. Even though FN’s submission was not selected in the XM17 Modular Handgun System trials, the Belgian-based company provided the commercial market with a field-worthy design based off of its previously-successful FNS pistol. The FN 509 immediately gained acceptance with target shooters and home defenders, line extensions of the striker-fired, double-action pistol followed. Moreover, a compact-size variant was unveiled tailored for concealed carry with enhanced features.

FN’s 509 Compact Miniature Red Dot (MRD) FDE features the company’s patented Low-Profile Optics Mounting System, a unique setup designed to accommodate the industry’s most-trusted red-dot and reflex optics. Weighing in at 22.7 ozs. empty and measuring 5.2”-tall, 1.35”-wide and 6.75” long, the 509 Compact MRD holds up to 15 rounds of 9 mm Luger; 24-round magazines borrowed from the full-size variant also fit.


A modular polymer frame is provided with the 509 Compact MRD, and our test sample arrived in Flat Dark Earth (FDE). FN provides interchangeable backstraps to accommodate various hand sizes and shooting grips its users require. Additionally, improved patterns of texturing combine to help manage recoil and stability.

FN 509 MAGS
Users of the FN 509 Compact MRD FDE pistol will find its controls, slide stop and magazine release, to be bilateral for strong- and weak-hand operation. An improved trigger that includes a passive safety mechanism is included—our test sample required a 7-lb., 1-oz. pull to release the sear.

FN Trigger An improved trigger that includes a passive safety mechanism is included

Topping the frame is a steel slide fitted with a 3.7”, cold-hammer-forged, stainless steel barrel. FN includes deep- and wide-cut serrations fore and aft for an enhanced experience when manipulating the slide. The tactical sights provided are designed to cowitness with mounted optics, and just forward of the rear sight is the company’s optic-mounting system and provided cover plate.

FN ships its 509 Compact MRD FDE in a soft-sided, zipper case that includes a FN Low-Profile Optics-Mounting System™ plate kit, one 12-round magazine with pinky extender and one 15-round magazine with grip sleeve—10-round units are provided for restricted-capacity localities.

FN 509 Compact MRD FDE Specifications

Make: FN America
Model: 509 Compact MRD FDE
Action Type: recoil-operated, semi-automatic, center-fire pistol
Chambering: 9 mm Luger
Frame: modular polymer
Barrel: 3.7” cold-hammer-forged, stainless steel
Slide: Low-Profile Optics Mounting System
Sights: dovetailed, raised square-notch rear, post front
Trigger: double-action, 7-lb., 1-oz. pull
Magazine: 10-, 12-, and 15-round detachable box
Length: 6.75”
Height: 5.2”
Width: 1.35”
Weight: 22.7 ozs. empty
MSRP: $799

This article first appeared on American Rifleman

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