Well, I know they don't take Rem 700 mounts, front and back has two drilled and tapped mount locations, they have the same centre to centre distance between them. Rem 700 setup at the back is little shorter. How do I know, the Rem 700 mounts I purchased yesterday didn't fit...! I actually called Merkel USA this morning, they confirmed I need Savage Long Action mounts. But distance between them seems way too apart and regular rings won't work (i.e. extended / offset rings may be required), so may be piccatiny rail is the easiest solution.