Here's the thing:during a different discussion regarding the series 80 block
a well regarded authority on the 1911 suggested that visually inspecting
the plunger for damage was the way to know whether all parts involved were
functioning correctly in other words if the plunger shows no sign of damage
it is not interfering with the firing pin during normal operation.
This is a sensible way to check the mechanism without going through contorsions or dropping the main spring housing,the fact that reloaded ammo
was used introduced yet another factor to be considered but those "dimples"
certainly don't belong in the firing pin stop.