Centercut, I have these features and way to mount:
One difference is the valve, latest sample had only one valve, you just need the one then you can uninstall the bottles without draining the last one empty.
Main difference is mine mount directly to the bottle thread on the rifle, you can change between a one or two bottle setup fast and without disassemble the rifle.
I have eccentric supports, they are adjusted to support the rifle body and tightened down, ones set they will always fit your rifle, this way you can adjust for tolerances and make sure the adapter does not wriggle or rotate ones mounted.
How samples was packed and sent
Interesting thing, everybody liked it,,,,,, now suddenly FX apparently had it for many years, just no one ever seen it
I wonder who would believe that.