Sig Sauer MCX Virtus Patrol in .300 Blackout with 11.5-inch barrel, using the MCX's proprietary folding-stock design and short-stroke piston for a folding AR-pattern pistol. Type: Pistol Action: Semi-Automatic Caliber: .300 Blackout Capacity: 30 Year introduced: 2018, Germany Weight: 96 oz Overall length: 28.5" Status: Active Intended use: Suppressor Host, Tactical