FN 509M MRD Midsize 9mm 4″ FDE 10+1

About this product

The FN 509M MRD is a midsize 9mm handgun configured for everyday carry and duty use. It incorporates the FN Low Profile Optics Mounting System for direct mounting of compatible miniature red dot sights and features a 4-inch hammer-forged barrel with a recessed crown. The pistol ships with interchangeable backstraps, fully ambidextrous controls, and two 10‑round magazines for immediate use out of the box. Its Flat Dark Earth polymer frame includes an integral accessory rail for lights or other attachments.

Key Specifications

• The caliber is 9mm.
• The barrel measures 4 inches.
• The standard capacity is 10+1.
• Includes two 10‑round magazines.
• The frame material is polymer.
• The frame finish/color is Flat Dark Earth.
• The sighting package is co-witness iron sights with an optics-ready cut.
• The listed weight is 26.5 oz.
• The overall length is 7.4 inches.
• Features the FN Low Profile Optics Mounting System for direct red-dot attachment.

Compact enough for everyday carry yet substantial enough for duty use, the FN 509M MRD pairs an optics-ready slide and a 4″ hammer-forged barrel with a midsize polymer frame and user-adjustable ergonomics. The included magazines and interchangeable backstraps provide immediate setup options for a range of hand sizes and carry preferences, making this a versatile option for those who prioritize mechanical reliability and modern sighting options.

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