Aero Precision's M4E1 platform in 6.5 Grendel, offering extended effective range and improved terminal performance over 5.56 in a direct-impingement mid-length AR-15 configuration with a 18-inch barrel. Type: Rifle Action: Semi-Automatic Caliber: 6.5 Grendel Capacity: 26 Year introduced: 2018, USA Weight: 100 oz Overall length: 36.5" Status: Active Intended use: Hunting, Long Range, Service