I'm still wondering who's got good enough eyes to peer all the way past the end of their arm(s), down the top of the slide, and then through the tiny peep hole in the front sight to find the target centered in it?
... Let alone see clearly enough through that little hole three feet away, to tell if you can see 20" of the enemy or 16" or 36" or whatever.
The more I ponder this the sillier I feel for bothering to try.