RMB-93

The RMb-93 is a pump-action shotgun designed and manufactured by the KBP Instrument Design Bureau of Tula, Russia. It is the baseline model of the Rys ("Lynx") series of shotguns, taking the model name of Rys-K. The RMb-93 has been conceived as a combat weapon for Special Forces and Police units that might face Close Quarters Battle situations. The weapon was engineered to reduce the size as much as possible.

== Description == The working system of the RMb-93 is itself an odd slide-action operation called "Inverted Cycle", similar in concept to the one used in the South-African Truvelo Armoury Neostead shotgun (the only other mass-produced firearm to be based upon this system). The magazine tube is placed over the barrel rather than under it, and is accessed through a flip-up cover on the top of the receiver. Once the weapon is loaded, a shell is chambered by pushing the slide forward-then-backward, instead of the standard backward-then-forward motion of the forend found on most pump-action weapons. Having the RMb-93 a fixed breech face and movable barrel, the operation moves the entire barrel assembly. Once a round is fired and another is chambered, the empty shell falls downwards to the ground, pushed by its own weight. The design of the RMb-93 "Rys-K" carries several advantages: the ejection system makes the gun fully ambidextrous, and the magazine located over the barrel gives the shotgun a low center of mass and reduces upward recoil. The main drawback of the overall design stands in the fact that the weapon has a pistol grip with an top folding metal stock, which blocks access to the loading port in the folded position. The RMb-93 thus can not be reloaded without extending or removing the stock, a disadvantage if it is being used tactically with a folded stock.