just call ARMS directly, pretty sure they can sell and ship you a mount without the need for a middle man.
I tried the bassett a long time ago......
the arms 18 is a solid option, it's what I use

and I don't know why when guys come on here and ask for advice for "product A" and guys come along and feel the need to offer up "product B" because an internet personality recommended it too them LOL priceless

my next favorite are the smith enterprise mounts but they are heavy and costly.
I've been using the arms 18 mount for over a decade and have installed dozens on other's rifles. it remains as one of the best optics mounting options I have used, and I've darn near used/installed them all.