Olympic Arms' K3B in 6.5 Grendel — an early adopter of the cartridge developed by Alexander Arms. The 6.5 Grendel in a standard AR-15 lower provides significantly greater long-range performance than 5.56 NATO with manageable recoil, and Olympic Arms was among the first to offer it commercially. Type: Rifle Action: Semi-Automatic Caliber: 6.5 Grendel Capacity: 26 Year introduced: 2006, United States Weight: 96 oz Overall length: 32.5" Status: Discontinued Intended use: Hunting, Target Shooting