look at it this way
real life : iron sigth-->1x
scoped---->4x
FH2 : iron sigth--->2x
scoped---->4x
if you are gonna have normal weapons with zoom to represent RL better resolution, then scoped weapons should also have a bigger zoom, regardless of what their zoom was IRL, so in this example, instead of 4x we should have x6 or something along that line. otherwise your are making the advantage of scoped weapons (long range accurate) really small, when you can engage at long range with a simple ironsigthed rifle