New for 2020: FN 509 Midsize MRD FDE

posted on April 12, 2020

FN America, LLC recently announced the availability of the FN 509 Midsize MRD in flat dark earth. The FN 509 is a striker-fired polymer-framed handgun that was first introduced three years ago as an open-market version of the company’s XM17 Modular Handgun Systems entry based off the older FN FNS-9.

Where the normal FN 509 is a full-size chambered in 9 mm Parabellum with a 17-round magazine, the FN 509 Midsize is a new addition to the FN 509 family in a slightly smaller package. The FN 509 midsize is very similar to the fullsize, but with a smaller frame that can be more easily concealed without losing the controllability given with the grip-size. It also has a slightly smaller magazine capacity of 15 rounds, with the option for 10-round magazines as well for compliance in certain states.

The FN 509 Midsize MRD FDE has the same controls and most of the same features, with a few additions. Like the fullsize, the midsize has ambidextrous magazine release buttons and slide catches on both sides of the frame. The safety is built into the trigger and there is a Picatinny rail segment molded into the dust-cover for attaching accessories. The backstrap can be changed out and the grip-frame itself has aggressive texturing for improved grip. Enlarged serrations are on the front and rear of the slide for improved grip when charging. The barrel is cold hammer-forged with a recessed target crown.

Other than the size, another different of the FN 509 Midsize MRD FDE versus the normal fullsize model is the slide is optic-ready, with a removable panel behind the chamber and in front of the rear sight. This accommodates several small-optic options on the market like the Trijicon RMR or SRO. The iron sights are raised to allow their use through the lower portion of a small reflex sight when mounted.

The frame and slide are both in FDE with the hues between the two being slightly different as FN is known for when it comes to the color. The FN 509 Midsize MRD FDE comes in a soft-sided case, magazines, and all the optic mounting hardware included. The retail price is $800. For more information on the FN 509 Midsize MRD FDE please visit


Rock Island Armory TM22
Rock Island Armory TM22

Review: Rock Island Armory TM22

In 2021, Rock Island Armory shook things up in the defensive-pistol world when it launched the aluminum-based STK100, and in 2022 the company continues its commitment to “Total Metal” firearm construction with the TM22 rimfire rifle.

The Armed Citizen® March 27, 2023

Read today's "The Armed Citizen" entry for real stories of law-abiding citizens, past and present, who used their firearms to save lives.

New For 2023: Marlin Model 336 Classic

The first Marlin 336 introduced under Ruger's ownership will be the "Classic," and the model remains true to the original design, albeit with a few subtle updates.

In The Fold With ArmaLite

The Tech Files, dating back to the early 20th century, are a treasure trove for editorial researchers looking for unique firearm facts. File folders from the industry’s best-known manufacturers to the smallest of firms contain company literature, photographs, blueprints, drawings, schematics and more.

Product Preview: Peet SafeKeeping Dryer

Peet is primarily known for its line of shoe dryers and odor-eliminating products, but the company also offers a dehumidifier model intended for use inside gun cabinets and safes, to help fend off the formation of rust and the damage to your firearms that it can cause.

The .380 ACP: History & Performance

Despite disagreements surrounding the .380 ACP cartridge's performance, its history shows it to be a popular, effective round, because people have always enjoyed small, easy-to-carry pistols that can be quickly deployed.


Get the best of American Rifleman delivered to your inbox.