AR15 Mil Spec vs Commercial Detachable Carry Handle

Thanks for the info. It’s an important topic for anyone using open sights as a primary or secondary sighting method.
I’ll bet a lot of people have scratched their heads in confusion wondering why their mismatched parts didn’t seem to match.
The front sight base height also needs to be considered if doing a specific witness of the front fight base with a red dot in the rear.