The Rising Bite is one of the most distinctive locking mechanisms in British gunmaking, patented by Westley Richards in the 19th century and subsequently adopted and refined by John Rigby & Co. The locking bite rises from the top rib to engage a recess in the standing breech, providing an exceptionally strong and self-tightening lock-up. Rigby's Rising Bite Double Rifle in 450/400 NE combines this robust action with the moderate but versatile 450/400 cartridge, producing a double rifle that has been used on African game for over a century. Type: Rifle Action: Double / SxS Caliber: 450/400 Nitro Express Capacity: 2 Year introduced: 1879, United Kingdom Weight: 182 oz Overall length: 42.5" Status: Active Intended use: Dangerous Game / Safari