FN 509M MRD Midsize 9mm 4″ Optic-Ready Pistol Black

The FN 509M MRD is an optic-ready midsize pistol designed for concealed carry and everyday carry roles. It features the FN Low Profile Optics Mounting System to accept a range of miniature red dot optics and a polymer frame that keeps weight and bulk moderated for carry. The package includes two magazines and interchangeable backstraps for a tailored grip profile.

Key Specifications

• The caliber is 9mm Luger.
• The barrel measures 4.0 inches.
• The frame is constructed from polymer with a matte black finish.
• The slide is optic-ready/serrated for direct optic mounting and improved manipulation.
• The pistol uses the FN Low Profile Optics Mounting System with multiple optic footprints.
• The sights are black co-witness iron sights.
• The firearm ships with two magazines and includes interchangeable backstraps.
• It features a MIL-STD-1913 (Picatinny) accessory rail on the frame for lights or accessories.
• The design is a midsize form factor intended for concealed/everyday carry applications.
• The pistol is compatible with larger-capacity FN 509 magazines when used with appropriate magazine sleeves.

The FN 509M MRD balances a compact, carry-minded profile with an optic-capable slide and practical features for daily use. Its modular grip options and accessory rail make it adaptable for a range of carry setups and personal preferences.