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Yes and no,
The Model 77's use two different heights between the front and rear rings.
The 77 rim fire rifles use the same height of rings both front and rear.
Check shopruger.com
Hope this helps
David
P.S. I see the answers on Rimfire on the same question have taken care of this.
The mounts are the same, but M77's require two sequential heights, whereas, 77/22, 77/44 and No.1's require the same height, front and rear. You can get what you need from Snapshots @ 1-450-427-0052.