I needed a riser to fit the RMR onto my AR15 and this is what I came up with.
3 slots on a single rail section for RMR, Bushnell trs25, and any other optics or accessories that are too low on their mount.
I've uploaded 3 STLs
First is a whole body print. It will print with a small gap between the clamping piece and will easily come apart. This will result in the best quality print.
Second is the Main Body and Right Side. If your printer isn't tuned well, print them separated and with supports. it is easier to take a file or Dremel and sand down the rough parts than to try to mount something completely out of spec on your weapon.
If you print it, please post photos!
If you enjoy this model, feel free to donate.