LaRue OBR (Optimized Battle Rifle) in 5.56mm — Texas-made precision AR with proprietary adjustable gas system, match barrel, and LaRue handguard. Available in 16" and 18" barrel configurations. Known for exceptional out-of-box accuracy; favored by high-power competitors. Type: Rifle Action: Gas-Operated Caliber: 5.56x45mm NATO Capacity: 10 Year introduced: 2008, USA Weight: 104 oz Overall length: 43.5" Status: Active Intended use: sport, competition