The Sun Optics Ruger M77 Big Bore Rifle Weaver Base Adapter gives you the ability to use a weaver style base on your rifle. It is made of aluminum and comes in a black finish. It has steel clamps and a cam system lock.

Specifications and Features:
Sun Optics
Ruger M77 Big Bore Rifle Weaver Base Adapter
Aluminum
Black Finish
Cam system lock on mount
Precision steel machined clamps