The Heavy Tank M6 was an American heavy tank designed during World War II. The tank was produced in small numbers and never saw combat. 1 × 3 in (76.2 mm) gun M7 (75 rounds) 1 × 37 mm (1.46 in) gun M6 (202 rounds) 2 × .50 cal (12.7mm) Browning M2HB machine guns, hull (6,900 rounds) 2 × .30 Browning M1919A4 machine guns, one fixed (bow), one flexible AA (5,500 rounds)