[Roach][Knuts], actually MoHAA weapons are shown in a position near the shoulder; to use the iron sights to aim you will need to have the weapon straight in front of you; look at these two pics to see the difference:
http://gamespot.com/gamespot/filters...49-257,00.html http://gamespot.com/gamespot/filters...649-56,00.html
I'm no skinner or modeller but I'm quite sure that this change of perspective will require a totally new model and skin.
I REALLY hope someone will do that.
Cheers