Optimized Battle Rifle in 5.56 with LaRue's enhanced BCG, 16 or 18-inch stainless barrel, and integral 1913 rail system. Built to MOA accuracy standards for a semi-auto fighting rifle. Type: Rifle Action: Semi-Automatic Caliber: 5.56x45mm NATO Capacity: 30 Year introduced: 2007, USA Weight: 112 oz Overall length: 36" Status: Active Intended use: Tactical, Precision