Maybe??
Here's What Made The M26 Pershing Tank Unique From Its Predecessors - SlashGear
American tanks have gone through many revisions, and sometimes those included large technological leaps that put the U.S. military far ahead on the battlefield.www.slashgear.com
I believe that's it. It's the only one I can find that has a barrel bulge like that, but not all did. And the only one I'm seeing with those rear hatches.
