The M-6 Heavy Tank was a short lived Armored Vehicle produced in 1940 for The US Army. While The United States was not yet at War with Germany and Her Allies, many knew that such entrance into The Conflict was but a ''matter of time''. As such, The US Military needed a reliable Armored Tank for potential War. The US Ordnance Corps. developed The M-6 for immediate trials. The US Army had few Tanks and the development of such in mass numbers was tantamount. Delay dates involving modifications greatly hampered mass productions. In the end, The M-6 was replace by the quicker produced and fielded M-4 ''Sherman''.
Weighing 57-tons, the M-6 was 30-feet long with a width of 10-feet. A Twin tracked vehicle, The M-6 was powered by a Wright G-200, 9-cylinder Gas Engine (825-mph). It was capable of 22-mph. Crewed by (6), The M-6 had Armor plating of 1.5 to 3-inches throughout. It's primary armament was a Multi-Barrel System of a 76mm Main Gun supported by a 37mm Gun. Secondary armament included Twin .50 Caliber Machine Guns and Twin .30 Caliber Machine Guns. Only 40 M-6 Tanks were produced with none seeing combat.