The AR-556 Multi-Purpose Rifle chambered in .300 Blackout pairs Ruger's value-oriented AR platform with an 18-inch medium contour barrel, free-float handguard, and Magpul MOE furniture. The 16-inch .300 BLK variant delivers subsonic performance in a standard carbine format. Type: Rifle Action: Semi-Automatic Caliber: .300 Blackout Capacity: 30 Year introduced: 2018, USA Weight: 68.8 oz Overall length: 32.25" Status: Active Intended use: Home Defense, Hunting, Multi-Purpose