FN 509 MRD Full-Size 9mm FDE Optics-Ready

The FN 509 MRD is a full-size duty-style pistol chambered for 9mm that is built for personal and home defense or professional use. It features FN’s Low-Profile Optics Mounting System with supplied plates for direct mounting of most pistol red-dot optics and a cold hammer-forged stainless barrel with a recessed target crown for durability and consistent performance. The pistol pairs a polymer frame with an enhanced grip texture and interchangeable backstraps for a secure, adaptable hold across users.

Key Specifications

• The caliber is 9mm.
• The action is a striker-fired semi-automatic design.
• The barrel is a cold hammer-forged stainless barrel with a recessed target crown; reported lengths vary (see notes).
• The overall weight is reported as 26.9 oz (manufacturer data).
• The overall length is reported as 7.9 inches.
• The magazine quantity included is 2 magazines.
• Capacity is reported as 10 rounds in several sources, though some listings reference alternate magazine counts (see notes).
• The frame material is polymer in a Flat Dark Earth finish.
• The pistol includes the FN Low-Profile Optics Mounting System with adapter plates for multiple optic footprints.
• Sights have been reported inconsistently; sources list both fixed and adjustable sights (see notes).

The FN 509 MRD combines a full-size platform with optics-ready capability and robust construction to serve duty-style, home-defense, and utility roles. With interchangeable backstraps and an enhanced grip texture, it adapts to a range of shooters while the optics mounting system supports modern sighting options. The included soft case and magazines make this a practical package for those seeking a configurable, full-size 9mm handgun.

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