FN 509 Midsize MRD 9mm 4-Inch Handgun, Two 10-Round Magazines

The FN 509 Midsize MRD is a 9mm Luger semi-automatic handgun with a 4-inch barrel and midsize frame. Its FN Low Profile Optics Mounting System supports direct mounting of compatible miniature red dot optics, while the ambidextrous controls and interchangeable backstraps provide adaptable handling for concealed-carry applications.

Key Specifications

• The chambering is 9mm Luger for compatibility with widely available 9mm ammunition.
• The barrel measures 4 inches for a midsize configuration.
• The standard capacity is 10 + 1 rounds as listed in the product data.
• The package includes two 10-round magazines.
• The slide is optic ready and serrated for compatible sighting configurations and slide manipulation.
• The sight system is described as co-witness iron sights.
• The frame is constructed from polymer and includes a MIL-STD-1913 accessory mounting rail.
• The controls are fully ambidextrous according to the product description.
• The barrel is cold hammer-forged stainless steel with a recessed target crown.
• The package includes two interchangeable backstraps, a soft case, locking device, and owner’s manual.

With its midsize format, optics-ready slide, adaptable grip configuration, and practical 10-round magazines, the FN 509 Midsize MRD offers a well-equipped platform for shooters seeking modern sighting compatibility and user-focused controls in a compact handgun.

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