Watching the upcoming MP5's sight picture makes me really want that this game would take into account the "ghost ring" effect for such sights.
This is the old America's Army 2 implementation of this feature on the M16A2 sights, massive difference:
No ghost ring effect:
After adding ghost ring effect:
Usually games end up solving this by enlargening the rear ring on the sights, but this more realistic approach would be of course better in my opinion.