Christensen Arms CA-15 AR-15 platform chambered in .450 Bushmaster with 16-inch carbon fiber barrel, offering premium weight savings on a big-bore hunting rifle. Type: Rifle Action: Semi-Automatic Caliber: .450 Bushmaster Capacity: 5 Year introduced: 2019, USA Weight: 80 oz Overall length: 32" Status: Active Intended use: Hunting, Sporting