Version of the K-91 with a forward turret. The vehicle was developed at the Design Bureau of the Ground Forces Engineering Committee under the leadership of A.F. Kravtsev from March to August 1949. The power plant was supposed to be a 12-cylinder boxer supercharged diesel engine. The functions of supporting rollers were to be performed by brackets with ski-shaped supports. Work on the vehicle did not go beyond the preliminary design and was stopped in December 1949. Machine specifications are subject to change without compensation.