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Not sure if this is the right place for this but here goes: After having my oldest (ser # 79-xxxxxxx)M77 re-barreled by Douglas (#4 26" 280 AI) and getting it to shoot (under 0.75" off a backpack on my picnic table)I decided some new glass was in order. I chose a Leupold VX-3i 4.5-14/50. This scope has a 30mm tube so I also needed some new rings to fit. Based on Leupold's recommendations elsewhere, I selected the Leupold "High" 30mm rings for M77. The Leupold rings will not tighten to my receiver. Leupold says this is a "known issue", my receiver is "out of spec", and they said they would send some alternate "keepers" which would allow me to use the rings. They failed to say the keepers were out of stock and that they had no idea when they would be able to send them to me. So I got to wondering why this issue is not mentioned in their advertising for these "precision, American-made rings". In any event does anyone have a suggestion as far as some rings which will fit? Thanks so much in advance
 

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I assume you have a Ruger M 77, with the Ruger integral ring bases. I also assume you have tried Ruger Rings on your rifle and they fit. That being the case, I suggest a set of Ruger 30mm high rings. In this chart you see the correct set is a 5B30 front and a 6B30 rear. Those are Ruger parts number 90274 and 90275.

http://shopruger.com/PDF/ScopeRingChart.pdf
 
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