Wideveiw Scope Mount Ruger Rings M77R, M77Rs, M77V Scope Mount Ruger Rings for M77R, M77R's and M77V Scope Mounts This scope mount is made of aluminum extrusion anodized bright for lifetime use The screws are heat treated socket cap screws and they have a special oversize head for more holding power in the aluminum The screws are heat treated socket cap screws and they have a special oversize head for more holding power in the aluminum 100% Manufactured in the USA