Italian made, the mateba is the only semi-automatic revolver. It fires each round from the bottom of the cylinder. Reloading is difficult because the cylinder swings out from the top, so the cylinder can't be emptied of spent rounds with the same hand that holds the gun.
the gun belonging to popular manga character Vash the Stampede's from the series Trigun is based off the Mateba.
I first became aware of the Mateba autorevolver a couple of years ago, this new handgun design appeared quite strange to say the least but it promised to be a new innovative design that might make some major improvements to the revolver design that has been basically unchanged in the 20th century.
You might be wondering what exactly a "autorevolver" is? Basically the Mateba operates like a regular revolver, it holds six rounds, you fire them and to reload you open the cylinder, dump the empties and reload, but the way that the Mateba does all of this is very unconventional.
First the Mateba has an interchangeable barrel system, not a bad feature to have in a handgun, the system is not unlike the system used on Dan Wesson revolvers for many years.
Developed by the Italian gun manufacturer Mateba Srl, the Mateba Autorevolver, sometimes referred to as the Mateba Model 6 Unica, is one of the few types of hybrid handguns called automatic revolvers.
This brings the barrel closer to the grip of the handgun, reducing the upward recoil of the gun and increasing accuracy.
The character Togusa in the various incarnations of Ghost in the Shell carries two different Matebas.