Great for rmr. bad for rmsc. don't try a romeo zero. - TANDEMKROSS Ruger Mark Series Shadow Mount V3.0

Mounts just fine to Ruger MkIII.

Works flawlessly with my RMR footprint optic. Mounts close to the gun. Using one direct mount plate is straighter than using a rail and adapter. Zero-in is fast.

I expect that this works just as great with Docter/Noblex & C-More RTS, but I can't test that.

Fits poorly to RMS/RMSc. That is the most common style. This mount does not use the front or rear mounting pegs for that footprint - two screws do all the work. Bad fit. To make this mount so universal, some difficult design decisions were made.

Do NOT try to mount a Sig Romeo Zero (RMSc footprint), it's not possible. That optic needs M4 screws, but this mount has small imperial threaded screws - those screws are too narrow to fit the optic. Don't use the M3/M4 combo screws that come with the Romeo Zero - they are metric and they will cross-thread the holes and ruin the mount.

You will have to use a rail and an adapter to mount the cheap Romeo Zero.

Some problems would be solved if this mount used metric thread, but that's another difficult design decision. C-More is designed for imperial thread, and uses the same holes as RMSc. I think I would have chosen differently.