Windham Weaponry CDI (Carbon Dioxide Impingement) with 16-inch barrel and enhanced features over the base SRC. Mid-tier complete AR-15. Type: Semi-Auto Rifle Action: Semi-Automatic Caliber: 5.56x45mm Capacity: 30 Year introduced: 2013, USA Weight: 63 oz Overall length: 32.5" Status: Active Intended use: General Purpose