The RSh-12 () is a Russian-made revolver chambered in 12.7ÃÂ55mm STs-130.
It fires from the bottom chamber of the cylinder (like the Chiappa Rhino and Mateba Autorevolver) rather than the more common top chamber, and is chambered for the same ammunition as the ShAK-12 battle rifle and VKS rifle.
A carbine variant was revealed in 2020âÂÂthough no information on availability or pricing has yet been released. It features a swing-out cylinder, picatinny rails above and below the barrel, and a skeletonised shoulder stock attached permanently to the grip frame. The 12.7mm MTs-569 version features a spring-buffered buttplate to dampen recoil.
The RSh-12 appears in the 2026 survival horror video game Resident Evil Requiem, where it is depicted as an oversized revolver under the name "Requiem" and used by Leon S. Kennedy and Grace Ashcroft. The weapon's depiction prompted fans to create memes and fan art highlighting its large size.