SPG on a modified chassis of the M47 medium tank. The prototype was produced in 1952, and in 1956 the SPG entered service in two variants: the M55 for the Army and the M53 for the Marines.
Time for the successive autoreloading of each shell into the magazine.
Characteristics are specified for Siege mode.
The technical characteristics are displayed for the charged turbine mode.
Characteristics are specified for Rapid mode.
Reload time of the first and second guns on double-barreled vehicles.
Characteristics are specified for vehicles with crews trained to 100%.