The offset rings, if used at the rear, often need to be ground down a bit to clear the bulge in the scope tube where the erector adjustments are. Otherwise, they don’t actually let you move a scope any further rearward than the standard rings. I’ve had to do that with both of the last two I tried.
I've noticed that with some scopes as well. The Nikon seems to be an exception in that I can position it so that the back of the turret housing is almost contacting the front of the rear offset ring without interference. I guess that's why I like the Nikon 1-4 on No. 1's - here are three that show how far back it can go:
![[Linked Image]](https://i.imgur.com/55Q4lej.jpg)
