Pfeifer Zeliska .600 Nitro Express revolver

The .600 Nitro Express Zeliska revolver is an Austrian single-action revolver produced by Pfeifer firearms. Except for the Giant 1859 28mm Remington revolver, 4.13 feet long, and except for the Thompson Contender .600 Nitro Magnum; the Zeliska may be the largest handgun in the world, weighing in at 6.001 kg and having a length of 55 cm. The cylinder section alone weighs 2.041 kg. The Zeliska is also one of the most powerful handguns in the world, producing a muzzle energy of 7,591 foot pounds. The weight of the gun helps control the recoil, making controlled shooting possible. The capacity of a Zeliska is five .600 Nitro Express or .458 Win Mag rounds. The Zeliska fires a .600 Nitro Express slug (900 grain) at 1,950 ft/s (594.36 m/s, 2,139.7 km/h). The cost of a Zeliska revolver is $17,316. Each .600 Nitro Express round costs $40, making this gun very expensive to fire.

Loading is accomplished through a loading gate located on the right of the cylinder, similar to the Nagant 1895 revolver.

Added features to the gun include gold-plated hammer, cylinder pivot, action and the gold-filled inscription on the gun indicating the company's address.