This is a double barreled tank, may or may not be the first practical model. A short barrel is on the turret, and a very short barrel is at the hull. It has 3 machine guns, 1 heavy, 2 medium. Top barrel shoots armor piercing rounds, and the bottom shoots anti-infantry shells, but can actually shoot piercing shells if needed. Both barrels are the same caliber by the way, so logistics will be a bit easier. This tank will excel in urban and suburban combat, despite being slightly wider than normal tanks. It's top speed is 25 mph on asphalt, at the lower range of medium tank speed. Of course, it sucks at long range.
This is somewhat experimental.