While the SU-100-M-2 proved to be compact and light enough for a medium tank chassis as well sufficiently armoured, the SU-122-44 soon emerged as too big and too heavy. Thus, on March 7, 1945, by the commissariat's order № 107, all work on the SU-122-44 was terminated, whereas the SU-100-M-2 was redesignated as "Uralmash-1" and the production of a first prototype by May 1, 1945 was ordered. The designation Uralmash-1 had already been used for a different self-propelled gun design in August 1943, but that design had not been approved by the commissariat and was frozen at that time.