No. Does not fit RMR base. I'm using ADM's AD-TR and Leupold's riser to get to absolute cowitness height.
The AD-TR has the exactly correct locator pin pattern.
But, Leupold spazzed out on their riser. It only has two diagonal locators, pins on top, holes on the bottom. It needs the other two holes drilled on the bottom to capture the other two pins on tbe AD-TR. It is stupid on Leupold's part.
You have two choices if you want to use that rider. Either you can mill or grind off two diagonal posts on the AD-TR, or you can drill two shallow holes on the bottom of the Leupold riser. I drilled the two holes. It's easy. Make them a bit larger than needed in case your measurements are a bit off. The other two holes will precisely align the optic.
Others here are using the Leupold fixed Picatinny rail mount and riser together if they do not need QD.
At least one user here is using ADM's Picatinny mount. I'm not sure of the model and height and what spacer is used.
it's still early and other mounting options will emerge. Drilling a couple holes Leupold's riser and the AD-TR was my solution.