so we finally got the ring off.
all it took was an angle grinder.
cut the delta ring right off. once we got through, the threads gave away and it screwed off. Turns out a "technician" whom "works" at Xtreme Tactics used locktite in the threads without informing me, and set the thing in crooked. That, plus the rust is what caused it to sieze in such a way. go figure...
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