I just saw this on the Huben Power web site
External adjustment, have to drain the cylinder to adjust down.
It appears to offset the cylinder which should allow using cylinders with larger diameters like 86mm 1.1L
CF 1.1L are actually cheaper than 0.7L CF cylinders
It looks like you would need to remove the barrel to mount the regulator.
Have to fabricate at least 1 barrel band too.

Huben Power M18-Dream Universal Regulator Ultra-stable output pressure
Huben Power M18-Dream Universal Regulator Ultra-stable output pressure Universal regulator, the front end of the cylinder is M18*1.5 thread. Ultra-stable output pressure External adjustment function Air chamber volume 25CC Regulating pressure range 1000psi~4350psi Threads for connecting gas...
shop.hubenpower.com
It appears to offset the cylinder which should allow using cylinders with larger diameters like 86mm 1.1L
CF 1.1L are actually cheaper than 0.7L CF cylinders
It looks like you would need to remove the barrel to mount the regulator.
Have to fabricate at least 1 barrel band too.