OK, here's another head-scratcher: the MG34 and the MG42 share the same 3D model for the receiver in both CMBN and CMFI. The difference between the two isn't drastic, but still, they are different. Here's a good pic showing the two side-by-side:
It just continues to baffle me why BF will go to great lengths to model the vehicles in such excellent detail, but then we get all these gaffes with rifles, carbines, and machine guns. It isn't like detailed photos and diagrams of these weapons don't exist.