Regarding ABM-X-2, the Argun radar is a component of the Avrora ABM system according to Podvig. Avrora was based on ABM-1/A-35 technology, which would seem to fit with the Argun being at that site at Sary Shagan with a TRY ADD and the PHASE ADD. Perhaps ABM-X-2 was the Avrora, and that was supposed to be tested at the Sary Shagan site, before it was dropped. Then the radars were reassigned or whatever to laser research with the laser arrays nearby. That would seem to fit with all of the data we have. ALso I should clarify, when I said "upgraded A-35", I didn't necessarily mean to imply that it was an upgrade that would be applied to the sites around Moscow, but rather that the system components of the ABM-X-2 were modified and upgraded from A-35 components. At any rate, if ABM-X-2 was Avrora, everything lines up nicely: the Argun radar at the test site, the PHASE ADD at the test site, and the lack of any apparent progress in an ABM role as Avrora was in fact not proceeded with.