The first prototype of the T23 was completed in January 1943. To complete it so quickly it initially had a welded turret, but later prototypes were cast.
It was found that the T23 was overly heavy and thus had poor ground pressure.
Built at Detroit and first to be completed.
The gyrostabilized gun could fire a 15.4 lb APC shell at a muzzle velocity of 2,600'/sec. There was also a 9.4 lb HVAP shell.
The 76 mm gun was gyrostabilized and could fire a 15.4 lb APC shell and a 9.4 lb HVAP shell at a muzzle velocity of 2,600'/sec.
In July 1943 the Ordnance Department proposed that the T23E3 would be standardized as the M27 Medium but this was denied.
T80 Gun Mount
The T80 gun mount that was used in the T23s later was designated the M62 and was used in M4 Mediums that had 76 mm guns.
The hatch for the loader was on the left. A cupola was installed in the turret top for the commander.