FN 509M 9mm

The FN 509M is a midsize tactical pistol designed for versatile use on the range, for everyday carry, and in duty roles. It is optics-ready and features a threaded barrel for accessory compatibility without altering the pistol’s core ergonomics.

Built for shooters who require consistent performance, the 509M balances controllability and capacity in a polymer-frame package with factory night sights and a smooth trigger break.

The pistol’s design emphasizes durability and ergonomics, featuring a polymer frame with interchangeable backstraps and enhanced grip texture for repeatable handling. The slide is finished in black with an optics-compatible footprint, and the cold hammer-forged threaded barrel provides a recessed target crown and polished feed ramp for reliable function.

Key Specifications

• The caliber is 9mm.
• The action is Semi-Auto.
• The barrel length is 4.5 inches.
• The magazine capacity is 10 rounds.
• The package includes 5 magazines.
• The thread pattern is 1/2×28.
• The optics footprint is MULTIPLE, making the slide optics-ready.
• The weight is 27.9 oz.
• The frame material is Polymer.
• The sights are Night Sights.

State Restrictions: This firearm is not available for sale in California and Illinois.

The FN 509M 9mm midsize tactical pistol is a balanced, optics-ready option for shooters seeking threaded-barrel capability and a multi-magazine package. FN 509M performance is delivered in a durable polymer frame that supports practical use across range, carry, and duty applications.