As far as direct mount G43X MOS optics go, what is your favorite? Must be RMSc pattern. So far, mine is the Romeo-X Compact. As an FFL in a state where constitutional carry is recently enacted, everyone seems to be looking for recommendations. Between the G43X and Micro Dagger, it's becoming quite a quite common request.

I've run/owned them all. I buy Holosuns now. Just finished changing all my dots to EPS and EPS Carry's.

For the options they provide at a price point I feel is fair. They can't be beat.

Edit: Don't forget the EPS and EPS carry come with a RMSc plate. So you can use them on a 43X without having to modify the slide. If you want direct mount, you have to remove the rear lugs and lower the front lugs. Easy to do with a dremal or file.

Also Shadow System slides are direct mount. Here's one on a Micro dagger.