Merkel B4 over-under double rifle chambered in .470 Nitro Express with 23.6-inch barrels, purpose-built for cape buffalo and elephant. Type: Rifle Action: Break action double Caliber: .470 Nitro Express Capacity: 2 Year introduced: 2010, Germany Weight: 122 oz Overall length: 40.5" Status: Active Intended use: Dangerous game / Big game hunting