FN 509 Tactical 9mm | 4.5″ Threaded Barrel | 17/24 rd | FN66100373

The FN 509 Tactical is a purpose-built version of FN’s proven 509 platform, featuring a 4.5-inch cold hammer-forged stainless-steel threaded barrel, Flat Dark Earth slide and polymer frame, and suppressor-height night sights. It ships with one 17‑round and one 24‑round magazine and uses FN’s Low-Profile Optics Mounting System to accept a range of miniature red dot optics without permanent slide milling. The pistol offers interchangeable backstraps, an enhanced grip texture, and fully ambidextrous slide stop and magazine release for right- and left-hand operators.

For an optic under $1,000 that pairs well with this platform, consider a compact miniature red dot such as the Holosun 507K; its small footprint and proven performance make it a common match for MRD-ready pistol slides. Recommended applications for this pistol include competitive pistol events where a threaded barrel and high-capacity magazines are advantageous, and precision suppressed-range training where the 4.5″ threaded barrel and suppressor-height sights improve sight picture with a red dot.

Product Specifications

• The caliber is 9mm Luger.
• The action is a Semi-Auto striker-fired design.
• The barrel measures 4.5 inches and is cold hammer-forged stainless steel.
• The barrel thread pattern is 1/2″ x 28 for common 9mm suppressors.
• The optic mounting system is FN Low-Profile Optics Mounting System (multiple MRD footprints).
• The sights are suppressor-height night sights.
• Included magazines are one 17‑round and one 24‑round magazines.
• The product includes 2 magazines in the package.
• The frame material is polymer with an enhanced grip texture.
• The frame color/finish is Flat Dark Earth.
• The slide is an optic-cut, serrated stainless steel slide with a sight-protecting slide cap.
• The unloaded weight is approximately 27.9 oz.
• The overall length is 7.9 inches.
• The twist rate is 1:10 RH.
• The UPC is 845737009137.

The FN 509 Tactical balances modern optics-ready features with practical ergonomics. Its threaded cold hammer-forged barrel, suppressor-height night sights, and high-capacity magazine options make it suited to competition and precision suppressed-range work while offering the durability expected from FN’s military-derived designs. The included magazines and FN soft case provide immediate utility out of the box, and the low-profile optics mounting system preserves flexibility for a range of miniature red dot options.

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