The FN 509C 9mm Luger Pistol is constructed with a threaded steel barrel, a stainless-steel serrated slide and a polymer frame, and it features a Vortex Viper red dot sight. An FDE textured with interchangeable backstrap grip and Picatinny rail complete the design. FN 509C 9mm Luger Pistol - Handgun Semiauto Center Fire at Academy Sports