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AFAIK, the barrel for both is made by OFB. Rest of the subsystems are all different. Kalyani uses more imported content (APU, etc is imported). TATA uses Indian APU. Not sure but from what I remember, TATA ATAGS does not have auto-loader.
So autofrettage happens in Kanpur OFB?
Bharat Forge makes the barrels. ARDE transferred that to BF.
The ordnance including barrel and breech mechanism, on both variants of ATAGS, is developed at Kalyani Group Advanced Artillery Manufacturing Facility.
https://defenceaviationpost.com/mak...king-world-record-firing-48-km-range-pokhran/