FN 509T Tactical 9mm | 4.5in Threaded Barrel | FN 66100527

The FN 509T Tactical is an optics-ready extension of the FN 509 family that incorporates FN’s Low-Profile Optics Mounting System (U.S. Patent No. 10/352654) and a 4.50-inch cold hammer-forged stainless steel barrel with 1/2″ x 28 threads. The slide includes a protective slide cap and serrations for positive manipulation; the platform pairs with suppressor-height tritium night sights and is built on a matte black polymer frame with a Picatinny rail. For an optic under $1,000 that fits the intended role, consider pairing this pistol with a compact MRD such as the Trijicon SRO or a comparable miniature red dot that co-witnesses with suppressor-height sights.

Applications: suppressed shooting and duty/service or range training where an optic-ready platform and threaded barrel are desirable.

Product Specifications

• The caliber is 9mm.
• The action is listed as Double Action Only in the product attributes.
• The barrel measures 4.50 inches and is cold hammer-forged stainless steel with 1/2×28 threads.
• The frame is matte black polymer with a MIL-STD-1913 accessory rail.
• The slide is optic-ready, serrated stainless steel and uses the FN Low-Profile Optics Mounting System (U.S. Patent No. 10/352654).
• The sights are suppressor-height 3-dot tritium night sights.
• The trigger pull is listed as 5.5–7.5 lb.
• The weight is 27.9 oz.
• The overall length is 7.9 inches.
• The rate of twist is 1:10 RH.
• The grip includes interchangeable backstraps.
• The barrel features a thread cap with integrated O-ring to help prevent loosening.
• The UPC is 845737010195.

The FN 509T Tactical emphasizes an optic-ready slide, a threaded cold hammer-forged barrel suitable for suppressor use, and a durable polymer frame with enhanced grip texture and interchangeable backstraps. Its suppressor-height night sights and low-profile optics mount make it a practical choice for shooters who want an MRD-capable platform with thread-ready suppressor compatibility.

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