The FN 509 Midsize MRD pistol in 9mm with a Flat Dark Earth finish and no manual safety (brand part no. FN 66-100742) is an evolution of the FN 509 Midsize built around FN’s Low-Profile Optics Mounting System, giving concealed carriers direct-mount compatibility with more than 10 different miniature red dot optics. FN America builds the pistol with a 4-inch barrel and a standard 10-round capacity, and the platform accepts larger-capacity FN 509 magazines with a sleeve. Improved backstrap texturing on two included backstraps aids recoil management, and a new flatter-faced trigger allows for a more controllable press. Among optic-ready semi-auto handguns, this 509 Midsize MRD FDE configuration favors EDC carriers who want red-dot compatibility.

Key Specifications

• The chambering is 9mm, and the capacity is 10+1 rounds.
• The barrel measures 4 inches, and the finish is Flat Dark Earth.
• The slide is optic ready and serrated, with black co-witness iron sights.
• The trigger is an improved flatter-face design for a more controllable press.
• Two backstraps with improved texturing ship with the pistol.
• The magazine accepts larger-capacity FN 509 magazines with a sleeve.
• Ships with two 10-round magazines.
• Rifling twist rate is 1:10-inch.
• Capacity is 10+1 rounds.
• The action is Double Action Only.
• The slide is optic ready/serrated.
• The design is classified as Semi-Auto Pistol.

Frequently Asked Questions

Can this pistol accept higher-capacity magazines? Yes, larger-capacity FN 509 magazines fit with the appropriate sleeve.

Does this pistol come optic-ready? Yes, the slide uses FN’s Low-Profile Optics Mounting System, compatible with over 10 red dot models.

Buy the FN 509 Midsize MRD Pistol, FDE

Direct red-dot compatibility in a concealable FDE midsize frame is exactly what this 509 delivers. Order it from our Lubbock, Texas gun shop for fast, insured shipping to your FFL.