FN 509 Tactical 9mm 4.5-Inch Threaded FDE Pistol

The FN 509 Tactical is a full-size 9mm semi-automatic pistol configured with a 4.5-inch threaded barrel, optics-ready slide, and suppressor-height night sights. Its Flat Dark Earth polymer frame features an integrated MIL-STD-1913 accessory rail, enhanced grip texturing, and interchangeable backstraps for adaptable handling.

The pistol uses FN's Low-Profile Optics Mounting System and includes one 17-round magazine and one 24-round magazine. The threaded barrel has a 1/2 x 28 pattern and an integrated O-ring thread cap.

Key Specifications

• The chambering is 9mm for compatibility with 9mm Luger ammunition.
• The operating system is semi-automatic.
• The barrel measures 4.5 inches and features a threaded configuration.
• The threaded barrel uses a 1/2 x 28 thread pattern.
• The included magazines provide 17-round and 24-round capacities.
• The slide is optics-ready with FN's Low-Profile Optics Mounting System.
• The pistol is equipped with suppressor-height night sights.
• The frame and grip are made from Flat Dark Earth polymer.
• The frame includes a MIL-STD-1913 accessory rail.
• The listed weight is 27.9 ounces.

With its optics-ready slide, threaded barrel, night sights, ambidextrous controls, and adaptable grip configuration, the FN 509 Tactical brings a well-defined feature set to range, duty, and training applications. The included two-magazine configuration adds practical flexibility to an already capable full-size platform.

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