I've seen this silliness alluded to repeatedly and I just witnessed it again on a Youtube video.
Vickers is handling a student's new G19X and the student makes some comment about "that's not the mechanical zero for that pistol". I assume the rear sight is sitting right of center. Larry comments that most RH shooters hit left, and LH shooters hit right.
The student then says "I like 'em set in the middle." Larry asked "Can you shoot it that way?" The student replies, "Yea, I think so ..... yea." The look on Larry's face to that remark is absolutely p r i c e l e s s!
As many as half of the agency issued Glock's I've test-fired and issued (several hundred guns in all) needed the rear sight moved slightly right of center to zero. I've read some pretty mindless commentary on why this occurs and to be quite truthful, I really don't care why it is what it is.
I would like to think it's reasonable logic to presume that adjustable and/or driftable sights are meant to accommodate the shooter. An acceptable zero has nothing to do with the physical position of the sights on the slide anymore than an internally centered reticle will render you a zero with a scope.
Anybody have a clue where this nonsense originated?
(All the relevant conversation is in the first 30 seconds .....)
https://www.youtube.com/watch?v=yUHMhrfz43E