I have used this one with the included short riser on many old shotguns with a lot of drop. Works well for me. It does not add cast on as most risers do. You can see how it works if you look close. As your face moves up the riser becomes narrower.
The negative is how to attach it. First you must remove the ridge around the area that touches your wood or it will cause damage eventually. I sand the inside smooth which only takes a few minutes. the strap that holds it does not work because as you shoot it the saddle moves forward since the stock is thinner as you go forward. I have used vet tape or a drop or two of epoxy or crazy glue. The glue might be a problem when you try to remove it. Somebody creative might be able to add a strap connected to the butt to stop forward movement.
This has been the only way that has worked for me. All the others have increased cast on too much.
https://www.accu-riser.com/accu-riser-ambidextrious-comb-raiser-cr-6000/
