The LaRue Tactical OBR (Optimized Battle Rifle) in 5.56x45mm with a 16-inch barrel is a precision-grade semi-auto AR-15 known for exceptional accuracy. LaRue's match-grade stainless barrel and proprietary PredatAR stock make it one of the most accurate factory AR-15s produced. Type: Semi-Auto Rifle Action: Direct Impingement Caliber: 5.56x45mm Capacity: 30 Year introduced: 2007, USA Weight: 7.5 oz Overall length: 34" Status: Active Intended use: Precision, Range, Competition