Nitro Express, 600 revolver Zeliska is a single action revolver made in Austria and produced by Pfeifer firearms. It is the biggest gun in the world, weighing 6.001 kg (13.230 pounds) and having a length of 55 cm (22 inches). The cylinder section weighs 2041 kg (4,500 lb). The Zeliska is also the most powerful weapon in the world, producing a barrel of more than 6 kilojoules of energy (4,400 ft lbf). The weight of the gun can control the fall, thereby controlling the shot. The ability of a Zeliska is five or 458 Nitro Express Mag, 600 Win tours. Zeliska fire a slug, 600 Nitro Express 462 meters per second (1,660 mph, 1030 miles per hour). The price of Zeliska revolver is over $ 16,000.