I don't have any other link to the vendor but he seems legit and the cost is certainly right considering the scope mount. He seems to possess many of the parts including the mounting block and spacer. Sign-0 Productions Firearms Instruction test it out at Signal-0.com Conventional M14 and M1A https://stephenbmvlt.blogdal.com/29922492/indicators-on-m14-ebr-stock-you-should-know