Leupold std base for ruger 10/22 - Leupold STD 1PC 1-Piece Bases

Two minor quibbles: first, the rearmost counterbore for a mount screw was in a thinner section of the mount, so the screw itself was too long and had to be filed down. Second, the supplied Torx wrench was cheaply made, and a VERY loose fit in the socket - I used my own Torx driver, which fit properly.
Pros: Solid, traditional design with windage adjustment
Cons: None to speak of

This review was written in the old system and had content requirements that are different than reviews written today.