I think KAC does runs or periodic releases since availability of particular models certainly seems to fluctuate.
I couldn't find one in stock anywhere for the longest and then a bunch popped up and I snagged one. Finally got the stamp back two weeks ago (along with the QDC suppressor) and I couldn't be happier with the combo.
I know I posted about it here once though and a dealer in the SE somewhere mentioned they had a bunch. Maybe the same thing will happen again!
SR-30 9.5"s are currently in stock at a few places. Hopefully I can snag one of those before a drought hits as well.
14.5" SBRs seem to be not as readily available currently either.