Parashooter wrote on Oct 2^nd, 2018 at 5:14pm:

At the risk of being tedious, once again: those pictured screws and sight are completely normal. The front counterbore is shallow because it is in the leaf spring, not the sight base - if deeper it would leave little or no thickness below the screw head. Further, as posited above, the front screw head is well protected by the folded leaf so there's no reason to set it flush anyway.

Not tedious.  Nobody is challenging your info, or whether or not there is a problem with the way it was done, or whether it is correct or not.  My last question in fact assumes your info is correct.  The question had to do with understanding why Springfield saw fit to create a seemingly unique screw (the head of the front screw is almost twice as tall as the rear) for this application.  While there may have been no reason to set the screw flush, it seems there was likely a reason to not set it flush ... it may be as simple as easier removal, maybe it was easier to machine.  I don't know, but I was hoping somebody on the forum might know.