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T his gun, designed by A.E. Nudel'man was another enlarged NS-37 and also known under the designation OKB-16-57.
It seems that there were only test installations of this gun in some prototypes during the closing stages of the war and the immediate post-war period. Apart from the MiG-9 prototype shown above this may have included a small number of Yak-9Ks also. Obviously the weight, recoil and dimensions of this weapon prevented its successful use in aircraft.