FN 509M Tactical 9mm | 4.5″ Threaded Barrel | 5x10rd | 66-101710

The FN 509M Midsize Tactical is an optics-ready 9mm midsize pistol offered in Flat Dark Earth with a 4.5-inch threaded barrel and a five-magazine bundle. It ships with five 10-round magazines, low-profile night sights, interchangeable backstraps and a threaded 1/2″-28 barrel for suppressors or trace devices. For a compatible optic under $1,000, the Trijicon RMR Type 2 is a common pairing that fits the low-profile optics-mounting system used on this platform.

Typical uses for this pistol include everyday carry where a midsize grip and controllable slide impulse are desired, and duty or range work where optics and a suppressor-ready barrel add versatility.

Product Specifications

• The manufacturer is listed as FN America / FN Herstal.
• The model/marketing name is FN 509M Midsize Tactical.
• The manufacturer’s part number is 66-101710.
• The caliber is listed as 9mm Luger.
• The barrel measures 4.5 inches.
• The frame material is polymer.
• The finish/frame color is Flat Dark Earth.
• The listed magazine capacity is 10 rounds (per magazine).
• The package includes five 10-round magazines.
• The pistol is described as optics ready with a multiple optic footprint.
• The sights are described as night sights (suppressor-height three-dot set referenced in vendor text).
• The listed weight is 27.9 ounces.
• Other notable features include a 1/2″-28 threaded barrel and included backstraps and ballistic case.
• The UPC for this item is 845737017408.

This FN 509M Mid-Size Tactical bundle is built to be a versatile service-minded pistol: optics-ready for fast target acquisition, threaded for accessories, and offered in a durable Flat Dark Earth finish. The included five magazines and accessories make it a practical package for shooters who want a ready-to-configure midsize pistol that balances shootability and capacity.