The Turán III's prototype with an actual turret was finished in February 1944. Unlike the frontal armor of the superstructure which was thickened by riveting two armor plates together the 75mm thick armor plate of the turret was made of only one. Ground and shooting test were done after it and the prototype was accepted for mass-production. However, no more 43.M Turáns (a.k.a. Turán III or Turán 75 long), or Zrínyi I's were constructed because of the lack of materials and the fact that after the Occupation of Hungary in March 1944 Germany did not allow further tank and gun productions, restricted the Hungarian industry to only spare part manufacturing level.(This was circumvented most likely in case of the Tas 44.M's development.)