I don't have any other link to the seller but he looks legit and the cost is unquestionably appropriate looking at the scope mount. He seems to get each of the elements including the mounting block and spacer. Sign-0 Productions Firearms Teaching test it out at Signal-0.com Normal M14 and https://sageebrstockm1a64073.livebloggs.com/35733050/not-known-details-about-socom-16-sage-ebr-chassis