The Ruger One Piece Weaver style scope base is made to fit the Ruger Mark I" Mark II" and Mark III models. This base will allow you to attach any standard weaver style ring. As a side not It will not work with Ruger Ring mount/Ruger style rings which are not weaver compatible.
Features:
Aluminum construction
OEM Ruger part
Includes hardware
Features:
Aluminum construction
OEM Ruger part
Includes hardware