FN 509M MRD 9mm 4″ Barrel 10-Rounds w/ Holosun 407C

FN 509M MRD Features

The slide is optic-ready and serrated, finished in matte black for durability and stealth. The Holosun HS 407C red dot enhances fast target acquisition and low-light visibility, while the suppressor-height co-witness iron sights offer immediate backup aiming. The 4-inch barrel includes a recessed target crown to preserve accuracy and protect the muzzle.

The polymer frame includes an integrated Picatinny rail for tactical accessories and interchangeable backstraps for ergonomic customization. With a flat-face trigger offering a smooth, consistent pull, and ambidextrous controls, the FN 509M is built for adaptability. It ships with two 10-round magazines, making it compliant with magazine capacity limits while maintaining full-sized capability.

FN 509M MRD Specifications

• Manufacturer: FN
• Model: 509M
• Series: MRD w/ Optic
• Caliber: 9mm Luger
• Action: DAO (Double Action Only)
• Type: Semi-Auto Pistol
• Frame Size: Mid-Size
• Frame Finish: Matte Black
• Frame Material: Polymer
• Frame Description: Polymer Frame w/ Picatinny Rail
• Slide Finish: Matte Black
• Slide Description: Optic Ready / Serrated
• Slide Material: Steel
• Optic: Holosun HS 407C Red Dot
• Sights: Co-Witness Iron
• Sight Style: Contrast
• Sight Configuration: Suppressor Height Co-Witness
• Barrel Length: 4″
• Barrel Material: Steel
• Barrel Finish: Black
• Barrel Description: Recessed Crown
• Twist Rate: 1:10″ RH
• Capacity: 10 + 1
• Max Capacity: 10
• Includes: 2 Magazines
• Grips: Interchangeable Backstrap
• Trigger: Flat Face
• Safety Features: No Manual Safety
• Overall Length: 7.40″
• Height: 5.20″
• Width: 1.35″
• Weight: 26.50 oz
• Hand: Ambidextrous