Aero Precision's large-frame M5 AR-10 pattern rifle in .308 Winchester with a 16-inch or 18-inch barrel. The M5 lower is compatible with DPMS Gen I pattern components, giving builders broad parts availability. Type: Rifle Action: Semi-Automatic Caliber: .308 Win Capacity: 20 Year introduced: 2015, USA Weight: 112 oz Overall length: 36.5" Status: Active Intended use: Long Range, Service, Hunting