Calibers: 9mm, .40 S&W. Capacities: 10- or 15-round magazine. .40 S&W (10 or 13). Barrel: 4.09 in. Weight: 25.6 oz. Length: 7.34 in. overall. Sights: Fixed 3-dot, drift adjustable. Features: Striker-fired system with HK enhanced light pull trigger. Ergonomic grip design with interchangeable backstraps and side panels. VP9SK is compact model with 3.4-in. barrel.