The CMMG Endeavor in .224 Valkyrie with a 20-inch barrel is one of the few production semi-automatic rifles chambered for this Federal Premium-developed cartridge. The .224 Valkyrie was designed to remain supersonic beyond 1,300 yards from a 20-inch AR-15 pattern barrel, offering .308-class long-range performance in a 5.56-size platform. The Endeavor provides a quality production platform for this niche cartridge. Type: Rifle Action: Semi-Automatic Caliber: .224 Valkyrie Capacity: 20 Year introduced: 2018, USA Weight: 122 oz Overall length: 40.5" Status: Active Intended use: Long-Range Competition / F-Class