MCX optimized and marketed specifically for .300 Blackout — suppressor-optimized barrel profile, adjustable gas system for both supersonic and subsonic loads. Factory SBR-length configurations available. Type: Rifle Action: Semi-Automatic Caliber: .300 BLK Capacity: 30 Year introduced: 2015, USA Weight: 123.2 oz Overall length: 35" Status: Active Intended use: Home Defense, Hunting, Service