Hello Curl

The rifle is a honey
I'll get more photos of it here

That stop ring needs to be where it is. It features a forward facing tang with a spade at it's end.
The scope doesn't have an integral rib. That tang acts as the alignment rib. The front ring features a groove at 12 O'clock, and that tang rides in the groove.

Scope is manually pulled back into battery position before the shot.
Recoil moves the rifle back, scope ends up sitting forward after the shot.

They feature a coil spring return on a different scope that they offer, and it can be supplied for this scope as well.