In 1997, the Mateba company developed a type of recoil-operated automatic revolver, the Mateba Unica auto-revolver, which uses recoil energy to auto-rotate a revolver cylinder holding 6 or 7 cartridges, depending on the model.
The Mateba Autorevolver’s barrel alignment is different from most other revolvers. The barrel is aligned with the bottom of the cylinder instead of the top. This lowers the bore axis (line of the barrel) which directs the recoil in line with the shooter’s hand thereby reducing the twisting motion or muzzle flip of normal revolvers.
