Main battle tank alternate ammo key bind on PC???

Hi!

I have searched forums, reddit and Chat GPT but the only answer I have seen so far is key nr4 which I definitely do not have in my game.

Nowhere in my ground vehicle drive keybinds is there an alternate ammo option and in game I can only toggle between primary and secondary, where secondary is the machine gun. I have seen videos on Youtube where the tank toggles between armour piercing and explosive ammo which is exactly what I would like to be able to do.

Please help, thx!