- Colt’s King Cobra Is Reincarnated For 2019 As The 6-Shot .357 Magnum Big Brother Of The Colt Cobra Double Action Revolver. Sporting A Heavy-Duty Frame, 3-Inch Barrel, And Brushed Stainless Steel Construction, The King Cobra Secures A New Place In The Legendary Heritage That Makes Colt Double-Action Revolvers Some Of The Hottest Collectible Firearms Today.