The Aero Precision M4E1 with 14.5-inch pinned and welded barrel offers a more compact profile than the 16-inch model while remaining Title I legal. The mid-length gas system is retained on the 14.5-inch configuration, providing the same soft-shooting characteristics as the longer version. Ships with Aero's ATLAS R-ONE handguard and a standard mil-spec trigger. Type: Rifle Action: Semi-Automatic Caliber: 5.56x45mm NATO Capacity: 30 Year introduced: 2016, USA Weight: 60 oz Overall length: 32.5" Status: Active Intended use: Patrol Rifle, Home Defense, Duty Use