Yes, I am aware of what a GP MG can do in real life, I am referring solely to game mechanics. If the PC goes first there is no 'dive for cover' option for opponents. A HBR is essentially an apocalypse stick in the game with Jury Rigged.
In personal combat yes... you don't just give the party combat encounter after combat encounter do you?
Also Vehicles... lightly armoured vehicles with lots of troops inside shooting back, or with vehicle weapons shooting back...
IMHO the Auto Cannon from the vehicle section is the broken weapon, it also has auto fire, but it does 3+success vehicle damage with every attack... THATS 30 PERSONAL DAMAGE + 10 FOR EVERY SUCCESS!!!!!!!! it can't be jury rigged as its not a personal weapon, but with that amount of damage who cares!
on the topic of vehicle weapons, any time they get pointed at people its a blood bath.