OTs-12

Experimental carbine developed in the early 1990s by TsKIB COO, OTs-12 Tiss (ОЦ-12 Тисс) "Yew Tree", literally a remodeled AKS-74U designed to chambered the 9x39mm calibre sub-sonic round. When compared to the AKS-74U, Tiss differs only in the bolt, barrel, muzzle-brake, and magazine, every other feature are practically identical. Gas-operated, rotating bolt operation, right side charging handle, magazine release behind the well just like all Kalashnikov derivatives. Tiss is fed with a specially designed 20-round box magazine and able to achieve a rate of fire of 800 rounds per minute, the 20-round box magazine was designed so that it would be compatible with standard current-issue ammo pouches, a larger 25-round magazine was planned before project's cancellation. With Tiss being built based on the AKS-74U chassis it would mean all the accessories available to 74U are compatible with Tiss, Warsaw Pact/Soviet Union issue accessories items such as clamp-mount for optics and even the BS-1 30mm suppressed grenade launcher could be mounted on Tiss if it made it into service. In 1993 a few hundred were built and delivered to the Russian Internal Troops for evaluation, the actual trial was likely a demonstration of 9x39mm calibre's devastation in close quarter urban combat against the 5.45x39mm M74, even when fired from a weapon frame that is cheaper to make than the AS Val. The production cancelled later that year due to the lack of interest on the weapon itself, though performed excellently during the trial, but there were too many other weapon using the 9×39mm calibre munitions of that era such as 9A-91 and SR-3 Vikhr, which were more compact and weights less than a default AKS-74U chassis with similar performance level. With project abandoned TsKIB COO started to work on the successor project OTs-14 Groza.