M77 and M77 MKII WEIG-A-TINNY® Style Scope Mount-Our Newest Scope Mount in the Ruger Rifle line. This mount converts the Ruger scope ring attaching points to a WEIG-A-TINNY® Picatinny Weaver style mounting point.
To determine if your rifle is the short action you need to measure from the center of the rear scope ring slot on the top of the receiver to the center of the front scope ring slot. The short action is 4” long, larger readings are the long action.
Dimension "A" is top of scope mount to top of barrel at the receiver attaching point
All Standard M77 Mounts Dimension "A" is .570"+-
All 20 MOA M77 Mounts Dimension "A" is .550+-
Add your ring height from where it contacts the top of the scope mount to the centerline of the ring
EXAMPLE: Using an M77X mount (.570") and our Medium Rings (.784") total distance is 1.354"
This height would allow for up to a 68mm Objective
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