I don't have any other link to the vendor but he appears to be legit and the cost is unquestionably appropriate considering the scope mount. He appears to own all the elements including the mounting block and spacer. Sign-0 Productions Firearms Teaching test it out at Sign-0.com This is actually https://erickfoeoa.blogginaway.com/30092354/a-secret-weapon-for-used-sage-ebr-chassis