Sionics Weapon Systems SAR3 AR-15 in .300 Blackout with 16-inch barrel, a mil-spec build from the Arizona manufacturer targeting quality-conscious buyers. Type: Rifle Action: Semi-Automatic Caliber: .300 Blackout Capacity: 30 Year introduced: 2016, USA Weight: 96 oz Overall length: 32" Status: Active Intended use: Tactical, Suppressor Host, Hunting