Aero Precision M4E1 in carbine configuration with 14.5-inch barrel and pinned muzzle device. Matches law enforcement patrol carbine spec. Type: Semi-Auto Rifle Action: Semi-Automatic Caliber: 5.56x45mm Capacity: 30 Year introduced: 2017, USA Weight: 60.5 oz Overall length: 30.5" Status: Active Intended use: Duty/Patrol