 By August 1943, the Ordnance Department M4 tank armed with 76 mm in the modified T23 turret was finally ready for production.A proposal was made by the tank forces for a test run of 1,000 tanks for combat trials and, if that was successful, then all of the M4 tank manufacturing capacity would be devoted to the 76 mm gun, but this was changed to a rate that would equip 1/3 of the M4 tanks with the 76 mm gun.The production proposal was part of a memo in September 1943 pointing out various flaws of the gun that made it less desirable for tank use