KWSN said: Realistically, the Zaku while firing a massive bullet is using it to try to take out the equivalent of a fly. No kill like overkill.
Speaking of which, isn't that bore diameter WAY bigger than 120 millimeters? I know there's some artistic perspective going on here, but it still seems way bigger than anything you'd ever see on a normal tank. The barrel seems more comparable to that of a railway gun.