R&D is now Howell's. I'm sure they do. Give them a call. I know that they will make one for you at the same cost if you send them your revolver so they can fit it.
Midway sells a drop-in for the Euroarms Rogers & Spencer 1858 Remmie. I have one. Fit and worked perfectly the first time I dropped it in. I havent seen a gated version anywhere.
