So 2x 260MP MG42s supported by ostruppen are okay, 4X 240MP maxims supported by flamer CEs are ok, but a single 300MP .50 supported by REs would be OP?
The timing is off IMO, it is the only HMG which can be built at 5-6 min mark and is rather expensive, can be countered quite easily and simply put, it doesn't cut it. Once in T1, its cost can be raised to 300MP in order to prevent the creation of USF maxim spam meta.
It can help diversifying the faction and giving them the tool they need to counter aggressive Kubel+Sturm douchbaggery.