Aero M4E1 configured for 6.5 Grendel with 18-inch barrel. Combines Aero's popular platform with the long-range 6.5 cartridge. Type: Carbine Action: Semi-Automatic Caliber: 6.5 Grendel Capacity: 30 Year introduced: 2017, USA Weight: 112 oz Overall length: 36" Status: Active Intended use: Hunting, Precision Shooting, Sport Shooting