The MCX Virtus in .300 Blackout is factory-configured for the suppressor-optimized cartridge. Adjustable gas system accommodates both supersonic and subsonic loads with or without a suppressor. The same platform as the 5.56 Virtus with caliber-specific internals. Type: Semi-Auto Rifle Action: SA Caliber: .300 Blackout Capacity: 30 Year introduced: 2018, USA Weight: 88 oz Overall length: 35" Status: Active Intended use: Tactical, Suppressor Host