The issue is with the bell running into the front ring. I set both bases so the ring is closest to the ejection port, the bell is hitting the forward ring and the scope is still not far enough back.

I had this issue with a couple M70's and DD bases....had to get extended, reversible fronts and that did the trick. Talley doesnt make extensions per my conversation with their CS earlier today.

Yeah, well, you know, that's just, like, your opinion, man.