Comparing: FV215b (183) vs. Object 263

This proposed heavy self-propelled gun utilized components of the Mk.II Conqueror. The vehicle featured the gun in a rear-mounted rotating turret. The project was canceled shortly after a dummy vehicle was built.

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.