The Mkb42(W) is the only German assault rifle to have a recoil direction multiplier higher than 0.31, sitting at 0.5
This makes the Mkb42(W) jerk much more from side to side than other rifles in the STG family, which ironically means the Mkb42(W) is more unwieldly despite its much lower ROF.
It also possesses a bayonet lug which is not being utilized. It should be given a bayonet (along with the Mkb42H) to make them stand out against the MP43 and STG44 more.
Currently, the STG44 is a direct upgrade and there is no reason to use the Mkb42H or W over them. These changes to the Mkb42 rifles would not make them stronger than the existing STGs, but provide players with more variety in the tools they can use while most importantly keeping the balance the same as before.