Step into the field with the FN 509 Midsize Tactical 9mm Semiautomatic Polymer Frame Pistol. The 4.5-inch barrel is threaded with a 1/2x28 pattern, and the FDE polymer frame has an applied flat dark earth finish. FN 509 Midsize Tactical 9mm Semiautomatic Polymer Frame Pistol - Handgun Semiauto Center Fire at Academy Sports