I don't have any other link to the seller but he would seem legit and the worth is surely correct looking at the scope mount. He seems to get all of the parts including the mounting block and spacer. Sign-0 Productions Firearms Coaching check it out at Signal-0.com Item rates https://sageebrchassis70315.blogdanica.com/29440060/detailed-notes-on-m1a-chassis-kit