Metaba 6 Unica Semi-Automatic Revolver in 44 Remington Magnum, comes with hard case, cardboard box and copied manual. The finish is a very deep dark black. The Mateba Model 6 Unica (often known simply as the Mateba or the Mateba Autorevolver based in Pavia, Italy) is a recoil operated semi-automatic revolver, one of only a few of this type ever produced.
The Mateba Model 6 uses the recoil from firing to rotate the cylinder and cock the hammer, unlike conventional revolvers, which depend on the user physically pulling the trigger and/or cocking the hammer to actuate the weapon's mechanism of operation.
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.
The gun's entire upper assembly (barrel, cylinder and frame) are mounted on rails on the lower frame, which houses the trigger, hammer, and grip, and recoils 1/2 of an inch, or 12.7mm, on firing. The rearward motion of the upper assembly cocks the hammer, and the cylinder is rotated on the forward stroke