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 Ringmount/Ruger style rings which are not weaver compatible. The overall length of the one piece base is 4.75" and it is made from aluminum. The mount will come with all the necessary hardware in order to attach it to your firearm.
Specifications and Features:
One Piece Scope Base
Overall Length 4.75"
Note: This base will only accept Weaver style rings, it will not accept Ruger Scope Rings
Ruger Mark I, Mark II, and Mark III