Comparing: Centurion Action X vs. M48A2/T54E2/T123E6

The Action X turret was planned to be used for later variants of the Centurion tank. One prototype of the turret was mounted on the chassis of the Centurion Mark 7, and another was used for ballistic trials. The vehicles with the Action X turret never entered mass production or saw service.

A variant of the M48A2 tank with the T54E2 turret and 120-mm T123E6 gun. In 1958, the prototype underwent comparative trials aimed at choosing the armament for the new U.S. XM60 medium tank.