FN 509 Midsize Tactical | 9mm | 4.5in | P/N 66100746

The FN 509 Midsize Tactical is an optic-ready, suppressor-capable mid-size striker-fired pistol built for duty, carry, and training use. It features a 4.5-inch threaded cold hammer-forged barrel, an optic-cut slide that accepts multiple footprints, and suppressor-height 3-dot night sights for co-witnessing with red-dot optics. Controls and ergonomics are designed for ambidextrous operation and rapid sight acquisition in varied conditions. For a reliable red-dot pairing under $1,000 consider a Holosun 507C-style compact reflex sight for a low-profile, sight-picture-oriented solution.

Product Specifications

• The manufacturer is FN America / FN Herstal.
• The model series is Midsize Tactical (509 M / 509MT).
• The UPC is 845737011611.
• The caliber is 9mm.
• The action is Semi-Auto.
• The barrel measures 4.5 inches and is threaded.
• The thread pattern is 1/2×28.
• The slide is finished in Flat Dark Earth and is optic-cut/serrated.
• The frame material is Polymer with a Picatinny accessory rail.
• The finish type on internal surfaces uses a PVD coating where specified.
• The sights are suppressor-height 3-dot night sights.
• The optic footprint supports multiple red-dot footprints.
• The product ships with two magazines and an FN soft case.
• The firearm includes fully ambidextrous controls and interchangeable backstraps for user fit.

This Midsize Tactical configuration balances shootability and concealability while providing threaded-barrel capability and an optics-ready slide for modern sighting solutions. The 4.5-inch threaded barrel and night sights make this pistol suitable for professional carry profiles and extended range sessions where suppressor and optic compatibility matters. Its polymer frame and ambidextrous controls prioritize ergonomic handling and rapid follow-up shots.

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