The LaRue OBR in 20-inch barrel length is the longest configuration in the OBR line and targets precision long-range shooters who want maximum velocity from the 7.62x51mm cartridge. The 20-inch stainless barrel provides the best ballistic performance of any OBR configuration. Type: Semi-Auto Rifle Action: Direct Impingement Caliber: 7.62x51mm Capacity: 20 Year introduced: 2007, USA Weight: 10.2 oz Overall length: 40.5" Status: Active Intended use: Precision, Competition, Hunting