I assume this has to be a bug- the best rifle was removed from this class in co-op. In order to get an iron-sighted Mosin I'd have to take up a Marksman slot, which is a shame. I wouldn't want to deprive 8x scoped M14 bunny hoppers their experience when all I want is my basic boat oar and rifle combo, The Mosin Nagant.
Bring back basic Mosiny goodness for this class, both sides.