Razzmann gives a better TL;DR
Razzmann wrote:Line infantry MGs are basically standardised now. With a few exceptions: the MG3 (being quite a bit better) and the Type 73 LMG being slightly better in RoF and accuracy.
The other exceptions being Fusiliers '90 and Diggers '90 having a CQC MG with high RoF and bas Diggers having the bren.
Also, variants of the same MG used by infantry with different training will make the MG CQC when "upgraded" from line to shock and will increase accuracy. From shock to elite it will only increase accuracy in some cases (e.g. the Minimi) but not in all (e.g. l:MG3 being the same on Panzergrenadiere and Fallschirmjäger).
Overall a positive change IMO