FN 509 Midsize Tactical 9mm 4.5-inch Threaded

About this product

The FN 509 Midsize Tactical is a 9mm striker-fired pistol built for multi-role use, offering an optics-ready slide and a 4.5-inch threaded barrel for suppressor compatibility. Its mid-size polymer frame balances shootability and concealability for everyday carry, home defense, or duty applications. The platform features FN’s low-profile optics mounting system and suppressor-height night sights for practical use with modern sighting solutions.

Key Specifications

• The caliber is 9mm Luger.
• The barrel measures 4.5 inches and is threaded for accessories.
• The action is Semi-Auto.
• The firearm uses a polymer frame with a Picatinny-style accessory rail.
• Optics compatibility is provided by the FN Low-Profile Optics Mounting System.
• The barrel thread pattern is 1/2×28.
• Sight set is suppressor-height 3-dot night sights.
• The package includes two magazines.
• The slide is an optic-ready serrated steel slide with a matte black finish.
• Controls include fully ambidextrous operating controls.

Purpose-built for shooters who want a practical, adaptable pistol, the FN 509 Midsize Tactical combines an optics-ready slide, threaded barrel, and night sights on a mid-size platform that balances control and concealability. Its configuration supports a wide range of modern accessories and use cases, making it a versatile option for daily carry, duty, or precision-focused practice.

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