Well if they go with a different length for the 125mm all I think that they will be able to go with is a 52 caliber length, maybe 53 caliber length. Interesting that they may go with a 120mm, must be in part due to one piece ammunition and matched with a bustle loader, it looks like that the Ukrainians may have offered them a little assistance with this. They have actually tested with a 140 mm quite extensively.
Why do you think that China would go with a 120mm.
Actually they study 120mm gun for quite some time, their first attend could date back to 1970 (some claim it is 1967) with Type-122 tank project, because of technical and manufactory difficulty the project was terminated.
They resume program around 1977 but because the associate tank chassis failed 120mm gun once again could not enter service. However they introduce the 120mm gun on to a Type 321 utility tracked chassis and change it into an anti-tank gun. This is later known as the Type 89 Tank Destroyer.
During Type-99 per-design phase there is also an argument between using 120mm and 125mm gun. Although 120mm never become MBT weapon, but they also never stop its R&D. So I am not surprise if they introduce it at the future.
PLA always known the benefit of 120mm’s one piece ammunition, but because lack associate autoloader it never become their MBT weapon. I believe there maybe also some political reason involved.
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