A little new life to the thread. In the SARCO description of the receiver they say concerning the square bridge feature:

Quote
Flat tops are parallel and at the same level.


This being the case might the flat tops be milled to accept vertical Talley steel rings if front and rear rings are of the same height? If so should make a very clean and firm mount.

“When Tyranny becomes Law, Rebellion becomes Duty”

Colossians 3:17 (New King James Version)
"And whatever you do in word or deed, do all in the name of the Lord Jesus, giving thanks to God the Father through Him."