The ring and base design are a copy of Burgess QR rings/bases I believe. I know he went that way as it’s the only QR system that he has been able to use under heavy recoil successfully.
Those rings are D’Arcy’s original design whereas Burgess rings are a vertical split ring design and are certainly a mechanical mousetrap. A couple of years ago while I was in D’Arcy’s shop he showed me the prototype of his rings he was working on and they are a very solid design, as to be expected from his shop. He also had an early 3D printed prototype of his action then and it was a very impressive effort to say the least.
