Caliber: 9mm. Capacity: 17- and 20-round magazine. Barrel: 4.0” or 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. For 2026, adds the factory-equipped 4.0FC 9mm COA with the Aimpoint A-CUT paired with the COA enclosed-emitter red-dot sight. Values are for the Standard 4.0C, 4.0FC, 4.5F models; add 56% for the 4.0FC 9mm COA variant.