I have no other link to the vendor but he seems legit and the cost is undoubtedly ideal thinking about the scope mount. He appears to own each of the pieces including the mounting block and spacer. Signal-0 Productions Firearms Coaching test it out at Sign-0.com Standard M14 and M1A https://sageebrstock31741.tokka-blog.com/29741648/detailed-notes-on-m1a-chassis-kit