The Windham Weaponry WW-15 MPC (Multi-Purpose Carbine) is a mid-length gas system AR-15 with a 16-inch cold-hammer-forged chrome-lined barrel. The mid-length gas system reduces felt recoil and improves dwell time compared to the carbine-length alternative. Built to mil-spec in Windham, Maine. Type: Rifle Action: Semi-Automatic Caliber: 5.56x45mm Capacity: 30 Year introduced: 2013, USA Weight: 6.95 oz Overall length: 32.5" Status: Active Intended use: general purpose, home defense, duty