The Rock River Arms LAR-15 Operator A4 is a tactical-configured AR-15 with a 16-inch chrome-moly barrel, quad-rail handguard, single-stage trigger, and six-position collapsible stock. Factory-equipped with vertical foregrip and sling swivel. The Operator designation targets the law-enforcement and military-adjacent tactical market. Uses RRA's standard mil-spec components with the addition of factory quad-rail. Type: Rifle Action: Semi-Automatic Caliber: 5.56 NATO Capacity: 30 Year introduced: 2007, USA Weight: 7.5 oz Overall length: 32" Status: Active Intended use: Tactical, Law Enforcement