FN 509 Tactical 9mm 4.5-inch Threaded Barrel FDE

About this product

The FN 509 Tactical is a duty-grade striker-fired pistol finished in Flat Dark Earth and built on the FN 509 platform. It features a cold hammer-forged stainless-steel 4.5-inch threaded barrel with a target crown and an O-ring retention thread cap. The slide accepts the FN low-profile optics mounting system and ships with suppressor-height night sights for co-witnessed optic setups. The polymer frame includes an enhanced textured grip, interchangeable backstraps and a MIL-STD-1913 accessory rail.

Key Specifications

• The caliber is 9mm.
• The barrel measures 4.5 inches and is cold hammer-forged stainless steel.
• The barrel is threaded with an 1/2 x 28 thread pattern and includes an O-ring retention cap.
• The frame finish is Flat Dark Earth on a polymer frame.
• The slide is optic cut and serrated and uses the FN Low Profile Optics Mounting System.
• The action is Double Action Only (striker-fired design).
• Sights are suppressor-height night sights for co-witness with miniature red dot optics.
• The grip is a FDE textured grip with interchangeable backstraps for fit customization.
• The pistol includes a MIL-STD-1913 accessory rail on the frame for lights or lasers.
• Controls include a fully ambidextrous slide stop lever and magazine release.

Purpose-built for suppressed and optics-equipped use, the FN 509 Tactical combines an optics-ready slide, threaded barrel, and robust FN platform features to support duty, competition, and precision-oriented applications. Its low-profile optics mount and suppressor-height sights simplify optic integration while the textured FDE frame and accessory rail provide practical ergonomics and modularity for a variety of setups.

Related Videos: