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I'm not sure if there is a real difference between how the M1A1HAs and M1A1s would perform against a frontal turret HEAT round. I thought the DU armor only really helped with KE rounds.
OP needs to add "paging Manic_Moran" to the thread title.
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Well, I don't hang out here often enough any more for it to work.
But the bottom line is that the difference is primarily in the ammunition, not the tank. We haven't generally sold depleted uranium ammo. That said, the 'non-du' ammo the Germans produce (and such as may be used by Australia) isn't bad. Also on the other hand, I think it's a traversty that to my knowledge the US Army still hasn't followed the USMC's lead and purchased HE rounds for the things.
There is some debate as to whether the quality control of the Egyptian-produced M1s are to the same standard as those built in Ohio. The individual components, in theory, would have been as good as the US counterpart tanks of the time (note, of the time, the Egyptian tanks pre-date the current A1 AIM SA tanks), given that we sent them the components, and they built them, but as I say, it's questionable.
Armor packages are another difference. The Aussies chose, for example, for whatever reason to not take the DU armor inserts and instead picked up some 'conventional' armor which probably costs three times as much, but they claim is just as effective. Whether or not the Kuwaitis, Iraqis or Saudis, for example, have such a package, I'm unsure.
The Aussie ones do come with a fridge, though, which is one up on us.