Fun fact: KV-4 was originally supposed to feature a 130 mm gun as its final upgrade. It was fully modeled but for unknown reasons, this never happened and it never appeared in the game.
Link to the article from 2012 where it is mentioned:
https://worldoftanks.eu/en/news/general-news/preview-future/
The original vk 100.01 p
Kv 4 130 . 490 alpha might be a nice buff to kv 4 or another tank itself. It be cool to see if it would help the kv 4 bc it’s pretty bad now. Honestly the kv 4 is all about armor it should get armor buff imo .
Agreed, buff the armour and give it the 130mm gun.