FN America’s FN 509 Tactical is an upgraded version of FN America’s popular FN 509 semi-automatic striker fired handgun. The FN 509 Tactical adds several features to the all-ready feature rich FN 509 series. Most notably the fact that it is compatible with and ships with two 24 round magazines (and one 17 round magazine). The FN 509 Tactical also features a threaded barrel (1/2"x28 tpi) making it ready for a suppressor or compensator right out the box, additionally these handguns come standard with suppressor height night sights. The FN 509 is the first of FN America’s handguns to use the patented FN Optics Mounting System, allowing you easily attach a wide variety of low profile reflex sights to the FN 509 Tactical. FN Optic Mounting System is compatible with: Trijicon RMR, Leupold Deltapoint Pro, Vortex Razor, Vortex Viper, Vortex Venom, Burris Fastfire II/III, Doctor Optic, CMore STS II, and more! Standard 509 FeaturesMil-STD-1913 RailEnhanced Grip TextureInterchangeable BackstrapsAmbidextrous Slide ReleaseAmbidextrous Magazine ReleaseCold Hammer Forged Stainless Steel BarrelEnhanced Front and Rear Cocking SerrationsFN 509 Tactical FeaturesFDE Carrying Case w/ Magazine StrapsLow Profile Reflex Sight CompatibleSuppressor Height Night Sights 1/2"x28 tpi Threaded Barrel24 Round Magazine CapacityFull FDE Slide and Frame4.5" Barrel Length FN America FN 509 Tactical 9mm NMS Black NS (2) 10rd Mag - Optics Ready 66-100527