If you plan on installing this base on an older Ruger M-77 with a tang safety, don't buy it. It won't work. It must be made for the newer M-77 models but it is not mentioned in the product description.
Product support didn't even answer my emails about this. You're on your own.
Pros: None
Cons: Everything
This review was written in the old system and had content requirements that are different than reviews written today.