20-inch barrel MPR variant in .450 Bushmaster, optimized for maximum velocity with the straight-wall hunting cartridge. The additional 3.88 inches of barrel over the 16.12-inch variant adds approximately 75 fps and improves accuracy at hunting ranges. Type: Semi-Auto Rifle Action: Gas-Operated Caliber: .450 Bushmaster Capacity: 5 Year introduced: 2022, USA Weight: 7.3 oz Overall length: 39.5" Status: Active Intended use: Hunting