Comparing: FV4005 Stage II vs. Object 263

This tank destroyer project was developed on the basis of the Centurion Mk3 tank in the early 1950s. The vehicle was initially tested with a mechanized ammo rack. However, the ammo rack did not fit the turret, and it was canceled. One prototype was manufactured and underwent trials, but the vehicle never entered mass production.

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.