The Windham Weaponry CDI (Carbon Di-Impingement) is a 7.62x39mm AR-pattern carbine with a 16-inch barrel built on a standard mil-spec lower receiver modified to accept AK-pattern 7.62x39mm magazines. The CDI allows AR platform shooters to use the 7.62x39mm cartridge with its better terminal performance at typical carbine ranges. Type: Rifle Action: Semi-Automatic Caliber: 7.62x39mm Capacity: 30 Year introduced: 2014, USA Weight: 7.1 oz Overall length: 32.5" Status: Active Intended use: general purpose, home defense, hunting