Christie was promised a cash reward if he produced a practical tank. Even after a failed test seven were ordered in June 1931.
Christie rebuilt the M1928 (T3 Medium) and added a turret. Engine cooling was found to be inadequate in testing.
The Soviet Union purchased two of the M1931 tanks and they were the genesis of the BT series of tanks.
The Cruiser series of British tanks were based on the M1931 Christie design.