Mine have been on back order with EuroOptic since November also. I called them a few weeks ago to follow-up on status but they weren't able to even venture a guess as to when the next shipment would be coming in.
ATI owns Tenebraex. Apparently the whole line just kind of got put on hold. Everything from SHOT has me concerned since ATI and Tangent Theta were asked about when they would start shipping product again and there was no response.