FN 509 Midsize Tactical 9mm 4.5-inch Pistol

The FN 509 Midsize Tactical is a 9mm Luger semi-automatic pistol built around a polymer frame and steel threaded barrel. Its optics-ready slide, suppressor-height night sights, ambidextrous controls, and integrated accessory rail support a versatile setup for range, duty, and training use.

The pistol features a 4.5-inch threaded barrel with a 1/2x28 thread pattern, a matte black finish, serrated slide, interchangeable backstraps, and an FN optics-mounting system. The package includes two magazines identified in the supplied specifications as one 15-round and one 24-round magazine, along with a soft pistol case.

Key Specifications

• The chambering is 9mm Luger for compatibility with commonly available 9mm ammunition.
• The operating system is semi-automatic.
• The barrel measures 4.5 inches and uses a threaded steel construction.
• The barrel thread pattern is 1/2x28.
• The slide is optic-ready and features serrations.
• The sight system is suppressor-height 3-dot night sights.
• The frame is made from black polymer and includes a Picatinny accessory rail.
• The controls are fully ambidextrous.
• The listed unloaded weight is 26.5 ounces.
• The package includes two magazines, identified as one 15-round and one 24-round magazine.

With its midsize format, threaded barrel, optics-ready slide, and adaptable control layout, the FN 509 Midsize Tactical offers a well-equipped platform for shooters who value configuration flexibility and straightforward, durable design.

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