Aero Precision M4E1 Enhanced complete rifle with 14.5-inch barrel. Upgraded furniture package with enhanced grip and stock. Pinned and welded muzzle device. Mid-length gas system. Type: Rifle Action: Semi-Auto Caliber: 5.56 NATO Capacity: 30 Year introduced: 2018, USA Weight: 59.2 oz Overall length: 31.5" Status: Active Intended use: Duty, Defense, Patrol