Never gonna happen with the Germans. Anyway we can develop our own guns, that's not the issue. It's about supporting and developing the T-90 fleet, which will be in use beyond 2060. Or, better yet, replace the T-90's current gun with our own, although I doubt that's planned.
What the Russians and the West did back in the 80s.
It's about not missing the bus.
The biggest tech transfer in history happened between the UK and the US in 1942, when the Brits transferred everything they had in exchange for American production. The next one came out of a defeated Germany and all the main allies benefitted from that.
Then came the end of the Cold War. Although we got some stuff, we could have gotten even more had it not been for our financial situation and American pressure. Otoh, the US and China benefitted a lot.
Now, is the fourth opportunity and India is at the forefront of getting tech from Russia. We need to extract as much as possible. Simply put, with just APFSDS tech, we are 30-40 years behind the Russians. It gets worse when it comes to more exotic tech like hypersonics, where even the Americans and Chinese are struggling.
This will be our first and only opportunity to close a more than 30-year gap we have with the West and Russia when it comes to materials.
Of course, all this cannot be done without sufficient carrots paving the road. And it can be done in a step by step process. Like, first bring spares production into India in order to eliminate Russian imports. Then bring in tech that was denied for existing systems, like some hot parts for the AL-31FP and Brahmos 1 engine, Smerch rockets etc. Then go for slightly more modern tech, like Brahmos M, new T-90 gun and shell, S-400 missiles and 117S engine, in case we are gonna re-engine the MKI. Later, more modern tech like the Brahmos 2 engine, SSN tech, BM tech. And so on.