The Bushmaster ACR with 14.5-inch barrel and pinned muzzle device achieves legal 16-inch overall barrel length while providing the handling benefits of a shorter barrel in the ACR adaptive platform. Type: Semi-Auto Rifle Action: Gas-Operated Caliber: 5.56x45mm Capacity: 30 Year introduced: 2010, USA Weight: 8.1 oz Overall length: 35" Status: Discontinued Intended use: Tactical