Caliber: 9mm. Capacity: 17- or 20-round magazine. Barrel: 4.5”. Sights: Adj. rear, post front, optics-ready. Features: Semi-automatic, double-action/single-action, steel frame, full-length dust cover, rail, ambidextrous thumb safety, threaded barrel, OD green or black Cerakote finish, red G10 grips.