FN 509M MRD Mid-Size 9mm | 4″ | 15+1 | 66100587

The FN 509M MRD is a midsize, optic-ready 9mm pistol built around FN’s Low Profile Optics Mounting System and a 4″ cold hammer-forged barrel. The design uses a striker-fired, semi-automatic platform in a matte black polymer frame with enhanced grip texturing and interchangeable backstraps for fit. It ships with an optic mounting package and two magazines (10- or 15-round magazines may be supplied depending on configuration).

For a durable, compact red dot that pairs well with the MRD footprint and stays under $1,000, consider the Holosun 507C series for its low profile and proven battery life.

Applications: everyday concealed carry (EDC) and range training/target work.

Product Specifications

• The manufacturer is listed as FN America / FN Herstal.
• The model is listed as the FN 509M MRD (mid-size, MRD series).
• The UPC is 845737010737.
• The caliber is listed as 9mm.
• The barrel length is listed as 4 inches.
• The overall length is listed as 7.4 inches.
• The weight is listed as 26.5 oz.
• The frame material is listed as polymer with a matte black finish.
• The barrel is described as cold hammer-forged stainless steel with a recessed target crown.
• The slide is described as optic ready / serrated and includes the FN Low Profile Optics Mounting System.
• The product type is listed as Striker Fired and the action is also listed elsewhere as Semi-Auto.
• Standard magazine capacity is listed as 15 rounds, and the pistol may also be supplied with 10-round magazines depending on configuration.
• The pistol ships with two magazines and an FN soft case, optic mounting system, owner’s manual and locking device.
• The sights are listed as black co-witness iron sights.
• The optic footprint is listed as multiple to accept several miniature red dot optics with included mounting plates.

The FN 509M MRD blends a midsize carry profile with features adopted from full-size platforms: an optics-ready slide, enhanced grip texture, and ambidextrous controls for usable ergonomics on the range or in carry. Its stainless cold hammer-forged barrel and removable backstraps give shooters a balance of durability and fit customization. If you value a platform that accepts modern miniature red dots and retains a familiar striker-fired trigger feel, the MRD provides those capabilities in a compact, service-style package.

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