 M4A3s were also used by British forces in Indonesia during the Indonesian National Revolution until 1946, when they were passed on to the KNIL, which used them until 1949 before they were passed on to the Indonesian Army.As the Sherman was being designed, provisions were made so that multiple types of main armament (specified as a 75 mm gun, a 3-inch gun, or a 105 mm howitzer) could be mounted in the turret.The possibility of mounting the main gun of the M6 heavy tank, the 3-inch gun M7, in the turret of the M4 Sherman was explored first, but its size and weight (modified from a land-based antiaircraft gun) made it too large to fit in the turret of the Sherman.