T-84O not having a proper gun in-game
The count for each ammo rack is 9 shells.
125mm caliber shells do not match the number of ammunition modelled into the tank. Not even the 21cm Jericho.
Perhaps there is no gun in the game as of now suited for the T-84O Zrazka.
Its quite common for ammo racks not to match their supposed guns ammo count. For example the Amx 50 Surbaisse has the same issue but a lot worse, with 3 shells in the hull being modeld becoming 7 in ammo count and 8 becoming 16
Also sturm has 12 shell models but can carry 24 shells