The FN 509 Midsize Tactical is a versatile 9mm pistol built around a midsize frame and full-size slide for a balanced combination of control, concealability, and duty-ready performance. Its striker-fired action features a duty-safe trigger with a 5.6-pound pull, while the ergonomic polymer grip and interchangeable backstraps help provide a comfortable, secure hold. The 4.5-inch barrel is threaded 1/2x28 and supplied with a thread protector, making the pistol suppressor-ready. FN's Low-Profile Optics-Mounting System supports a broad range of pistol red-dot optics, and suppressor-height three-dot night sights provide a clear aiming reference. The package includes 15-round and 24-round magazines.

Key features

• Midsize frame with full-size slide balances handling and sight radius for everyday carry, home defense, and duty use.
• FN Low-Profile Optics-Mounting System provides a flexible platform for compatible pistol red-dot optics.
• 4.5-inch 1/2x28 threaded barrel supports suppressor use and includes a thread protector.
• Suppressor-height three-dot night sights remain visible with an installed suppressor or taller optic.
• Striker-fired duty-safe trigger delivers a consistent 5.6-pound pull.
• Interchangeable backstraps and ergonomic texturing allow users to tailor the grip fit and control recoil effectively.

The FN 509 Midsize Tactical combines adaptable ergonomics, optics compatibility, and suppressor-ready features in a capable 9mm platform.