The Zastava 70 is a Rem 798 is a Charles Daly 98 is an Interarms Mk X varying to some degree in fit & finish. The scope bases from Leupold or whoever will fit that string of "commercial Mausers", all made by the same manufacturer in the former Yugoslavia, as well as the FN commercial versions as marketed by Browning, Sears and FN itself in years gone by. Medium rings on Leupold std bases labeled for FN or Mark X commercial mauser will work with a 3-9x40 scope with clearance front and rear.

“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."