Caliber: 9mm. Capacity: 17- and 20-round magazine. Barrel: 4.5". Grip: Textured polymer with a modular backstrap. Sights: Fixed, Tritium/luminescent front, Tactical Rack U-Notch rear; optics-ready. Overall Length: 8". Weight: 23.9 oz. unloaded with a flush magazine. Finish: Matte black. Features: Central Operating Group. Threaded barrel model.