FN 509M Midsize Tactical 9mm 4.5″ Threaded

The FN 509M Midsize Tactical is a purpose-built midsize pistol designed for everyday carry, duty use, and home defense. It is optic‑ready and equipped with a threaded, cold-hammer-forged barrel to accommodate suppressors and other muzzle devices. The pistol ships with two magazines and an FN soft case for basic transport and storage.

Key Specifications

• Chambered in 9mm Luger.
• Features a 4.5-inch cold hammer-forged steel barrel with a 1/2x28 thread pattern.
• Operates as a semi-automatic striker-fired pistol.
• Includes the FN Low-Profile Optics-Mounting System with a multiple optic footprint.
• Equipped with suppressor-height 3-dot night sights.
• Built on a polymer frame with an integrated Picatinny accessory rail.
• Includes two magazines and an FN soft pistol case.
• Weighs approximately 26.5 oz.
• Overall length is 7.9 inches.
• Features fully ambidextrous controls for right- and left-handed operation.

Purposeful ergonomics and balanced proportions make the FN 509M Midsize Tactical a versatile choice for shooters who value controllability, rapid sight acquisition, and modularity. Its optics-ready slide, threaded barrel, and night-sight package provide a practical baseline for users who plan to configure the pistol for range work, duty carry, or equipped defensive use while maintaining a mid-size footprint.