Fn 509, 9mm Luger, 4" Barrel, 17+1 Rounds, Matte Finish, Serrated Slide

The FN 509 9mm Luger brings together duty-level durability and shootability in a striker-fired, semi-auto pistol that evolved from the FNS Compact and was developed to meet MHS performance standards, proving reliability through more than a million rounds of testing. With a 4" cold hammer-forged steel barrel and target crowned muzzle, the 17+1 capacity pistol delivers consistent accuracy for range days, law enforcement duty, and home defense, while the serrated steel slide and matte black polymer frame provide resilient corrosion resistance and a secure grip profile aided by interchangeable backstraps. Ambidextrous controls and a Picatinny accessory rail make it user-friendly for left- or right-handed shooters and allow mounting lights or lasers for low-light scenarios, and the fixed 3-dot sights offer a fast, intuitive sight picture for defensive or competitive work. Weighing 26.9 oz and featuring a 4.00"×4.99" barrel length, the FN-brand handgun balances recoil management and maneuverability, making it a solid choice for shooters seeking a proven 9mm pistol platform with modern ergonomics, consistent cycling, and sights and accessory compatibility for tactical, training, and practical shooting applications.