I'm rather pleased with this mount base. The one-piece design helps when mounting a scope on old military mausers like mine. The only issue I had was with the original that I received from Optics Planet. One of the required windage screws didn't have any threads on it at all, and couldn't be used. I contacted Optics Planet & they asked me to return it, which I did. There was a delay in sending me out a new one, because there weren't any left in stock. However, I'm pleased with the final product.
Pros: The base is good quality @ fits the receiver exactly.
Cons: Had to return the first one, because one of the windage screws wasn't threaded properly.
This review was written in the old system and had content requirements that are different than reviews written today.