I’ve read that the problem is that most of ours have depleted uranium armor and highly sensitive electronics that we don’t want going to the other side.
Also hearing that we won’t send any depleted uranium shells for these tanks.
We don’t even use depleted uranium, solid,
Armour-piercing fin-stabilized discarding sabot (APFSDS) rounds anymore because they vaporise on contact with the target and radioactively polute the battlefield. We use tungsten rounds now.