FN 509M Midsize Tactical 9mm 4.5″ Threaded Barrel — 1×15 & 4×24

Description

The FN 509M Midsize Tactical from FN America / FN Herstal is a midsize, optics-ready 9mm pistol configured for a range of practical uses including everyday carry, duty, and home defense. It ships with a 4.5-inch threaded barrel and a set of magazines intended for both standard and extended-capacity use. The pistol is finished in black and equipped with night sights for low-light use.

Key Specifications

• The caliber is 9mm.
• The barrel measures 4.5 inches and is threaded 1/2″-28 for muzzle device or suppressor compatibility.
• This package includes 5 magazines — one 15-round and four 24-round magazines.
• The maximum magazine capacity supplied is 24 rounds (as supplied in the included magazines).
• The sighting system is suppressor-height 3-dot night sights.
• The slide accepts multiple optic footprints and is described as optics-ready.
• The frame material is polymer with interchangeable backstraps.
• The finish is a PVD black (listed as colored/black in source data).
• The unloaded weight is listed as 27.9 ounces.
• The pistol ships with two interchangeable backstraps and a soft ballistic case.

Balanced for practical use, the FN 509M Midsize Tactical brings optics compatibility, a threaded barrel, and a combination of standard and high-capacity magazines in a single package. Its proportions and accessory set make it suitable for shooters who want a flexible platform for training, duty tasks, or everyday carry that accepts common micro red-dot sights and supports extended range sessions without sacrificing a compact, carryable footprint.