Wanted: AF rifle details and your two cents

Been planning this one for a bit, it’s not quite “traditional AF”. 🙂

My understanding is that on the AF rifles, there is a bushing into which the valve threads to mount the valve/bottle to the rifle proper. I’m unclear as to how that bushing is secured. 😕

Just a couple grub screws? Or is there a lip on the bushing on the top hat side of the frame?

Figure at least ONE of you might have one of these rifles handy, or know the answer outright. 🙂

Any thoughts on the trigger bits would be welcome as well…easier by far to get it right the first time. It’s to be two stage with the usual adjustments.

This is what’s going down, with the exception of the valve being larger to support a 9mm barrel. The valve is laid out to accept a paintball type regulated tank…hopefully length of pull will not become an issue. ❓

This is knock to crack/blow open, with a degree of self regulation provided by the step on the spool. Should require opening forces similar to a disco (less if you consider it only needs to “crack” the valve). …with porting for a big bore.