Comparing: Object 268 Version V vs. Object 263

A tank destroyer based on the Object 730 (T-10) tank. Developed in the early 1950s. The project allowed a gun to be mounted in a rotating turret, enabling all-round horizontal fire. Most ammunition was placed in the rear of the turret in order to improve crew operating conditions. The project was cancelled, because expensive and complicated modifications of many basic components were required.

The development of a heavy tank destroyer on the basis of the IS-7 heavy tank was started in 1950. Three design projects were developed, one of which resulted in a full-size wooden prototype. However, further development was discontinued due to phasing out the IS-7 mass-production.