The pilot vehicles used the M3 chassis with an open-topped superstructure, mounting an M1A2 105 mm howitzer and, following trials, adding a machine gun, the T32 was accepted for service as the M7 in February 1942 and production began that April.
The pilot vehicles used the M3 chassis with an open-topped superstructure. The pilot vehicles were mounting an M1A2 105 mm howitzer. The T32 was accepted for service as the M7 in February 1942. This was following trials. Trials were adding a machine gun. Production began that April.