Just as a clarifying note--the adapter is not universal for all "ANVIS-style" mounts (4-Hole Pattern), but is a rail interface designed for the Wilcox DPAM/GSGM mounting systems.
Naturally as a confirmed ANVIS geek, I was in the front of the line to say "gimme gimme gimme"... and now I still haven't gotten around to installing it yet (taking off helmet covers is a big hassle, y'all...).
On the one hand, I'd be tempted to say "if you already own a GSGM or DPAM and an Ops-Core FAST SF, you clearly don't care what it costs,"
But the MBS (Modular Bungee Shroud) is available for $194.25 (comes standard with the FAST SF, but will fit any three-hole pattern helmet), while the GSGM Adapter is $99.99.
We have them available for order, and they will be on the website before too long, but in the meantime if you're looking for one, feel free to contact us via e-mail!
~Augee