Vall,
That is a unique system and the tapers must have taken a lot of skill to fit.

What are the steps for installing a barrel? Is there a gap between the adapter ring and the action when the barrel is snugged up?

There is probably an interesting thread that someone could start regarding the old takedown systems that forum members have in their possession. It seems that there was a demand for takedown systems and nearly every maker produced some rifles with one.

Dennis