LaRue OBR in 5.56 NATO with 18-inch stainless barrel, providing the extended precision configuration for the LaRue platform. The 18-inch OBR bridges the gap between the compact 16-inch and the full-length PredatAR barrel, offering a balanced precision-to-portability ratio. Type: Rifle Action: Semi-Automatic Caliber: 5.56 NATO Capacity: 30 Year introduced: 2008, USA Weight: 116 oz Overall length: 36.5" Status: Active Intended use: Precision Shooting, Tactical, Sniper