BreachBangClear posted an article about pistol optics. Some of the stuff is a good read for those who want to train certain aspects of their RMR topped pistol, specifically dot on target acquisition.
I always talk about using the clavicle notch to reference your pistol / sight orientation when drawing on a person. This is a good concept for those who carry an RDS on their pistol.
Frame off the clavicle and take shots, then find the dot and get the work done.