The MCX Virtus in 9-inch pistol configuration is one of the most capable short-barreled .300 Blackout platforms available, featuring SIG's folding stock adapter, M-LOK handguard, and a gas-piston operating system that runs both supersonic and subsonic loads without adjustment. Type: Pistol Action: Semi-Automatic Caliber: .300 Blackout Capacity: 30 Year introduced: 2017, USA Weight: 68 oz Overall length: 26" Status: Active Intended use: Home Defense, Suppressor Host, Tactical