The SIG Sauer MCX Virtus 9-inch Pistol offers a middle-ground barrel length between the 5.5-inch Rattler and 11.5-inch standard pistol, balancing compactness with improved 5.56mm ballistic performance. Type: Pistol Action: Gas-Operated Caliber: 5.56x45mm Capacity: 30 Year introduced: 2019, USA Weight: 6.4 oz Overall length: 26.5" Status: Active Intended use: Home Defense, Tactical