FN 509 Midsize Tactical 9mm, 4.5 in Threaded Barrel FDE

About this product

The FN 509 Midsize Tactical is a mid-sized, multi-role 9mm pistol designed to be red-dot and suppressor-ready. It pairs a 4.5 inch threaded barrel with an FN low-profile optics-mounting system and fully ambidextrous controls for versatile carry, duty, and range use. The platform emphasizes balanced proportions that promote fast sight acquisition and controlled follow-up shots. The trigger is described as smooth with a clean break near the listed trigger-pull range.

Key Specifications

• The caliber is 9mm.
• The barrel length is 4.5 inches.
• The barrel is threaded with a 1/2 x 28 thread pattern.
• The operation is listed as double-action.
• The trigger pull is listed as 4.5–6.7 lb.
• The weight is listed as 27.9 oz.
• The overall length is 7.9 inches.
• The sight radius is 5.8 inches and it includes suppressor-height 3-dot night sights.
• The optics mounting system is the FN Low-Profile Optics-Mounting System.
• The ship package lists magazine configurations as one 15-round and one 24-round magazine or two 10-round magazines (configuration varies).

A purpose-built midsize platform, the FN 509 Midsize Tactical blends practical capacity and concealability with features intended for serious, utility-minded shooters. Its threaded barrel, optics-ready slide, and ambidextrous controls make it adaptable for a wide range of applications from everyday carry considerations to range and duty use while preserving predictable ergonomics and trigger performance.

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