So it required a crisis to Armor Corps to notice that the Chinese have a 35ton tank
Deployed since 2018..
The choice of main gun would be very interesting here.
The IA probably would push for the Roosie 125 mm 2A46 smoothbore main gun, logistical similarity et al. However the platform is essentially Korean and there would be some Korean involvement for sure (IP rights et al). Now, since Korea is aligned to the west I don't foresee the Russians very keen on India mating their main gun on a western platform. Also the plethora of using 2 piece ammunition, mating the auto-loader etc would be too complex to resolve in a small timeframe.
That opens up a very interesting possibility of using DRDO's own 120mm main gun from the Arjun Tank.
a.) No IP issues
b.) No Roosie interference
c.) Proven bustle mount ammunition stowage
d.) Cavernous interiors of the SPG platform would easily allow a 4 man crew.
If this possibility comes around, it might just breathe an air of life into the Arjun and make us significantly #atmanirbhar in Armoured vehicles. Heck, we could also convert the K9 platform into a massive ICV!