I haven't any other connection to the vendor but he looks legit and the value is unquestionably appropriate thinking about the scope mount. He seems to have every one of the parts such as the mounting block and spacer. Sign-0 Productions Firearms Schooling check it out at Signal-0.com Robert A. https://lorenzoxitcl.onzeblog.com/29524929/the-ultimate-guide-to-m1a-ebr-chassis