FN America 509 Tactical 9mm 10-Round Pistol Overview The FN 509 Tactical is a full-size, striker-fired 9mm pistol built for modern range use, home defense, and tactical applications. Its optics-ready slide, threaded barrel, suppressor-height tritium night sights, and fully ambidextrous controls provide a versatile platform in a durable polymer-frame configuration. Key Features FN Low-Profile Optics Mounting System accepts a wide range of miniature red-dot optics without direct slide milling Threaded barrel with 1/2" x 28 threads and O-ring retention thread cap Suppressor-height Trijicon three-dot green tritium night sights Cold hammer-forged stainless-steel barrel with recessed target crown, polished chamber, and feed ramp Fully ambidextrous slide-stop lever and magazine release Enhanced grip texture, interchangeable backstraps, and replaceable steel frame/slide rails MIL-STD-1913 accessory rail for compatible lights and accessories Sight-protecting slide cap with textured racking surface External extractor and loaded-chamber indicator NMS Model Specifications Caliber: 9mm Action: Striker-fired, double-action Capacity: 10 rounds Weight: 27.9 oz. Barrel Length: 4.5" Overall Length: 7.9" Height: 5.75" Width: 1.35" Twist Rate: 1:10" RH Trigger Pull: 5.5-7.7 lb. Sight Radius: 5.79" MPN: 66-100527 UPC: 845737010195 Applications Ideal for range training, home defense, tactical use, and users seeking an optics-ready 9mm pistol with suppressor compatibility. Its 10-round magazines make this configuration appropriate where magazine-capacity restrictions apply. Additional Features Includes two 10-round magazines, two interchangeable backstraps, an owner's manual, locking device, and FN-logo soft pistol case.