Comparing: AC 4 Experimental vs. Sherman Firefly

The tank was developed in 1943. An order was placed for 400 vehicles. The prototype was created on the basis of the AC 1 tank with an enlarged superstructure, which allowed mounting a modified turret from the AC 3 tank with a 17-pounder gun. In July 1943, the work on the project was stopped at the final stage, as the program for creating the Australian cruiser tank was discontinued.

A British version of the American M4 Sherman tank, developed in early 1944. It differed from the U.S. version by having a more powerful 17-pounder gun, different placement of the radio and ammunition, no bow gun, and no driver's assistant position. Between 2,100 and 2,300 vehicles of all modifications were built from 1944 through 1945.