Caliber: 9mm. Capacity: 17- and 20-round magazine. Barrel: 4.0”, 4.5”. Grip: Textured polymer with modular back strap. Sights: Fixed, Tritium/luminescent front, Tactical Rack U-Notch rear; optics-ready. Length: 8”overall. Weight: 23.9 oz. unloaded with flush magazine. Finish: Matte black, Coyote Brown or OD Green. Features: Central Operating Group. Threaded barrel model. Comp models with integral, single-port compensator.