RS Stamped Stacking Swivel
https://www.milsurps.com/images/impo...wivel_rs-1.jpg
I always knew these things existed as I have had many. I had a hunch that they were a spare parts contract. Many have said they were part of rifle production. That I do not know.
Finally I found the package which shows it as a spare part for the 03A1, which makes it early.
I have heard two different identifications of the maker for Remington. I have faith that John Beard knows the real one.
I cannot find the contract for either possibility because it is a sub contract of Remington and not a contract directly with Ordnance. In order to be sure in my mind I would have to have access to Remington's records, which I don't.
https://www.milsurps.com/images/impo..._rs_pack-1.jpg