The post-war period (1947 through 1956) saw the development of a system of mortars for the Soviet Army culminating in the most powerful and virtually unique piece of ordnance: the Oka 420-mmВ self-propelled mortar mount. For example, a significant portion (about 80 percent) of mortars used in combat operations during the Great Patriotic War that played a tremendous role in the Great Victory of 1945 were developed by KBM. The KBM history harbours a lot of brilliant achievements of its creative work. Prominent specialists вЂ“ N.A.В Dorovlev, S.V.В Gusovskiy, A.G.В Sokolov, S.P.В Vanin, P.V.В Goryachev, V.I.В Lukander, S.B.В Dobrinskiy вЂ“ made an outstanding contribution to the development of new mortar systems. In 1942, design bureau head and chief designer Boris I. KBM designers developed several versions of mortars for different combat use, they refined the design of 82-, 107- and 120-mm mortars.Д¬reative efficient work of the design bureau was highly appreciated by the Communist Party and the Government. In precarious and extremely difficult wartime conditions the KBM personnel quickly resolves various issues surfacing in use of mortars in troops, carries out manufacturer's supervision at factories and at the front itself, arranges manufacture of mortar armament that is continuously growing up in the course of war. Shavyrin who initiated and placed the work on a broad footing to satisfy army needs in mortar systems. In a short space of time, individual design groups separated by war were merged to a technically strong creative team headed by Boris I. The engineering design bureau, В«Konstruktorskoye byuro mashynostroyeniyaВ» (В«KBMВ»), awarded the order of Lenin and Red Labour Banner, was founded by Decree of the State Defence Committee No.1576 of 11 April 1942 to specifically develop mortar systems.

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