FN 66100741 | FN 509M MRD 9mm 4in FDE 15rd

The FN 509M Midsize MRD is an optics-ready midsize pistol configured in Flat Dark Earth with a 4-inch barrel and a standard 15-round magazine capacity. It uses FN’s Low Profile Optics Mounting System, which allows direct mounting of multiple miniature red-dot optics. For a rugged, proven pairing under $1,000 that works well on this footprint consider the Trijicon SRO as a sighting option.

This pistol is suited to concealed carry/EDC in situations that favor a midsize platform and for range training or competition where a compact, optics-capable pistol is desirable. The platform emphasizes practical controls, replaceable backstraps for fit, and an optics-ready slide to support modern handgun setups.

Product Specifications

• The UPC is 845737011567.
• The caliber is 9mm Luger.
• The barrel measures 4.0 inches.
• The standard magazine capacity is 15 rounds.
• The pistol ships with two magazines.
• The unloaded weight is 26.50 oz.
• The frame is constructed of polymer.
• The frame color is Flat Dark Earth.
• The slide finish/color is Flat Dark Earth.
• The slide is described as Optic Ready/Serrated.
• The optic footprint supports multiple miniature red-dot options.
• The sights are optics-ready with fixed combat-style iron sights.
• The barrel is cold hammer-forged.
• The overall length is 7.40 inches.
• The pistol ships with two 15-round magazines, an FN soft case, locking device, and owner’s manual.

The FN 509M Midsize MRD presents a purposeful, no-nonsense midsize handgun platform that pairs modern optics capability with FN’s ergonomic refinements. Its optics-ready slide and compact footprint make it a practical choice for shooters who want a controllable, adaptable pistol for everyday carry or competitive shooting. The included magazines and soft case provide a ready-to-use package for range sessions and training.

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