Ruger's direct impingement AR-15 at a budget-friendly price with 16.1-inch cold hammer-forged barrel. The DI companion to the piston SR-556. Type: Rifle Action: Semi-Automatic Caliber: .300 Blackout Capacity: 30 Year introduced: 2015, USA Weight: 112 oz Overall length: 32.5" Status: Active Intended use: Sport Shooting, Home Defense, Hunting