Aero Precision M5E1 in .308 Win with 16-inch barrel for a more compact AR-10 configuration. ATLAS handguard and enhanced receiver set. Type: Semi-Auto Rifle Action: Semi-Automatic Caliber: .308 Winchester Capacity: 20 Year introduced: 2017, USA Weight: 91 oz Overall length: 33.5" Status: Active Intended use: Patrol/General Purpose