Thank you for the Google info and link, however, the information provided there is far from conclusive.
(And there are numerous grammatical errors in the text of this Ambrsoft.com webpage - is this a foreign bot?)
The Rockstone site will let you order, but does it actually have product?
Two different addresses are given, a weird one in CO (Google maps can't isolate this location) and another in KS for returns.
They have not responded to a "contact us" form.
A search of several gun-related sites produced no hits.
I will not be ordering. Thanks all.