 A more satisfactory mounting was found in August 1943 by utilizing the turret design of the T23 tank on the M4 chassis to carry the 76 mm gun.The 76 mm M1A1 version of the cannon was created, having a longer recoil surface to also help with balance by permitting the placement of the trunions further up front.The new M18 Gun Motor Carriage armed with the 76 mm was the result of the Tank Destroyers' request for such a vehicle and as such they accepted them.