I was racking my brain trying to come up with who it was that imported them on armslist. Kebco. (Turns out it also wasn't armslist, but gunsinternational).
https://www.gunsinternational.com/kebco/-.cfm
$3200 is cheaper than the Nighthawk Korths by a fair bit.
I dry fired a Mongoose at SGC since they had one in the case. Very whelming. Not over, not under. Not for $4k.