Welcome to The Firing Line!
Contact Andy at Smith Enterprise, Inc.
, tell him what you have, what you want and ask him what he has to offer.
You won't be disappointed with the results.
I am in the process of moving my medium heavy 'Crazy Horse' M21A5 type SEI into an older ('05) SAGE EBR chassis that
was not designed to accept a medium heavy barrel. Choosing a mount, ring and scope combo is my next big challenge.