During the installation, the gun cradle cracked and repairs delayed the production of the vehicle even further. On May 6, 1942, all the preparations were done for ground testing, the gun cradle was repaired. The test was successful and the new heavy tank was put into service as the 41.M Turán (also known as Turán II or "Turán 75 short"). The first Turán IIs arrived with the troops in September–October 1943 because the production of gun optics and ammunition were delayed. By that time the Turán II became obsolete as well, but it was still lethal to T-34 medium tanks within 500 meters, which was still good progress compared to previous Hungarian tank capabilities. According to records from 1944, 129 Turán IIs were issued to combat effective units; factory notes recorded that 182-185 41.M Turán heavy tanks (Turán IIs) were manufactured. Aside from tank production, the chassis was the basis for the Zrínyi II assault gun. This mounted a 105 mm short gun in the hull and lacked the traversable turret of a tank. A total number of 66-72 Zrínyi IIs were made during the war. The only other vehicles known based on this chassis were the Turán III and the Zrínyi I, both of which used the 7.5 cm 43.M tank gun. Only two 7.5 cm 43.M tank guns were manufactured. The 7.5 cm 43.M tank gun was developed from the blueprints of the PaK 40, converted in a Hungarian style. Both vehicles were produced as prototypes only. The Turán III's prototype with an actual turret was finished in February 1944. Unlike the frontal armour of the hull which was thickened by riveting two armour plates together, the 75 mm thick armour of the turret was made of only one plate. Ground and shooting tests were carried out after the prototype was completed 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 Is 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 production, restricting the Hungarian industry to only spare part manufacturing level. It is not known if the prototypes of the Zrínyi I and Turán III were put into service and the fate of the Turán III and the Zrínyi I is unknown. In combat The Turáns