I don't have any other link to the seller but he appears legit and the cost is definitely appropriate taking into consideration the scope mount. He appears to have all the components such as the mounting block and spacer. Sign-0 Productions Firearms Coaching test it out at Sign-0.com 1913 Picitanny https://franciscokwgpa.onesmablog.com/the-5-second-trick-for-sage-stocks-69828978