Thank your very much for this comparaison between the two mounts Lou !
Getting a RMR Red Dot could have been a solution, but I really want to get a full chromed combo with the gun and the red dot.

In fact the only one red dot I found chromed is the Vector Optics Frenzy S :

… and it has a RMSc like footprint.

Until I find a RMR Chromed Red Dot, I will keep this solution and de-anodized a Jpoint Mount … I’ll post an update with pictures when the work will be done !

Thank you very much your answers guys !
If other folks want to share their red dot experience on S&W, feel free to post pictures of it !