Having an ammo counter in the top right corner of the screen is quite nice... too nice!
irl and in ace mod, you don't have a counter you just get an indicator about the magazines weight.
you could replace the ammo counter with a 3 or 4 divided bar indicating the approximate amount of bullets left...
or to go one step ahead, do it like it's done in the ace mod, indicate the weight while reloading... nothing more