The MR-412 REX ("Revolver for EXport") (also "MP-412 PEKC") was a short-lived six-shot revolver emerging from Russia in the early 1990s by way of the Izhevsk Mechanical Plant. The sidearm was developed with the export market in mind and not any one standing Russian military / police requirement. At its core, it became a conventional revolver with the usual traits afforded such weapons and a relatively new addition to the world of pistols. However, the MR-412 REX never entered serial production due to restrictive gun import laws in the United States - the largest potential civilian market for export firearms.
The design saw a large polymer grip used that featured an integrated trigger loop ring encompassing the small, curved trigger. The hammer was only slightly exposed at the rear of the frame. Iron sights were positioned at their usual places over the frame (forward and aft). The barrel was encased in a slab-sided assembly at the front of the gun and the lower section of the frame was completed of polymers while the rest of the weapon remained high grade steel.
One of the unique features of this gun was its "break-open" frame (reminiscent of 19th Century pistols) in which the forward end of the gun could be pulled down by the operator, along a centralized hinge, to expose the cylinder for reloading. This was a deviation from the norm where modern revolvers typically featured "swing-out" cylinders for the same action. The gun was available in both .357 Magnum and .38 Special chamberings and operated from a Single-Action / Double-Action (SA/DA) trigger system. A 4" and 6" barrel were also offered. An automatic ejector was part of the MR-412's makeup.