It was a concept that really went nowhere, like most prototypes that couldn't figure out the logistics or handling of such weapon. The Zenk RZMK-357 is one of those funky bullpup revolvers that was seen in Shotshows and then just disappear into nowhere, the revolver was chambered in .357 Magnum, featuring a mixture of both revolver handling and pistol ergonomics.
Functionality, nobody really knows how it works, but the way how it might work is that the revolver breaks open to allow the user to either load or eject rounds individually or use its cylinder release ejector mechanism at the front of the cylinder. Once pressed, it pops out the cylinder, like one of those old timey single acion revolvers.
It takes muzzle devices, has a small strip of rail at the top and also takes pistol stock.
Practical? No. Cool? Probably.
"Zenk RZMK-357" (https://skfb.ly/pxE6E) by Murai is licensed under Creative Commons Attribution (http://creativecommons.org/licenses/by/4.0/).