Guards Tank Killer Company

The hull was improved from the SU-85 assault gun with the addition of a commander’s cupola, the same as that found on the T-34/85 tank. It was housed in a cylindrical casemate to the right of the gun.

In 1944 the first 500 SU-100 assault guns rolled off the production line at the Uralmarch factory in Sverdlovsk (now Yekaterinburg).Another 1175 were built in 1945. They began replacing SU-85 assault guns in the medium assault gun regiments and brigades in late 1944.

SU-85M

The SU-85M assault gun was a stop-gap measure utilising the new improved hull built for the SU-100. Not enough 100mm D-10S gun were initially available, so 85mm D-5 S-85 guns were mounted some early production hulls. The major advantage of the new hull was that is could carry up to 60 rounds instead of 48 of the SU-85 hull.