The Windham RMCS-308 is a multi-caliber AR-10-pattern rifle that ships with components allowing caliber conversion between .308 Winchester and 7.62x39mm, a unique offering in the large-frame AR market. Type: Rifle Action: Semi-Automatic Caliber: .308 Win Capacity: 20 Year introduced: 2015, USA Weight: 84 oz Overall length: 38.5" Status: Active Intended use: Hunting, Tactical