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Not to go down the rabbit hole but DU armor is an addon or sandwich to most Chobham armor packs in the M1. However, I believe (needs verification) but US law prohibits the export of Depleted Uranium in some products, like tanks (to certain countries). Therefore, most but not all M1's exported have tungsten armor in place of DU. Chobham armor is a manufacturing process to harden the steel (again I believe) and then sandwiched with DU for US tanks and tungsten for export versions. Depending on which expert you speak with including Europeans the tungsten sandwich is just as effective as the DU. The reason most European tanks have tungsten is because the aversion to burning tanks loaded with radioactive DU all over Europe (in the event of WWIII). However, since US tanks have it, it's the price for US shouldering the defense of central Europe. I guess the thought of the Russian hordes advancing over the central European plains was enough to sway the Germans to allow DU armor in the US Tanks defending them. However, German tanks do not use DU armor.
Ukrainian tanks will most certainly not have DU armor (nor would they get DU sabot rounds) but may have tungsten.
Also I believe that the US Marines operated M1A1's upgraded to 120mm back in the Mid 2000's? So an "M1" might be a general media term for any "Abrams" tank. I would tend to think that the 105mm are a bit of a rare bird? Even back in the late 1990's the Guard was up gunning to M1A1's. I can't see the US supplying 105mm equipped tanks when the NATO standard is 120mm?
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