Have you ever been in a game with a hmg infestation that your assault rifle just can't take out? Well, I think I just found the HMG's weakness. The next time you are in your dropsuit making screen, make a loadout with a less expensive dropsuit and equip a MILITIA shotgun. If you specialize in sniping, AR, or anything thats not a shotgun, always have a shotgun class handy to take out those pests.

Make sure that you understand how the awful hit detection works. It's relatively consistent. Get as close as possible and spam all of your bullets until that thing dies. Don't run at it or let it see you before you start shooting. Try taking the flank or switching cover spots until you reach him.

I'm not sure why this works so well, but it definitely works. Maybe its because of the fact that heavies can't move or strafe fast enough to get behind cover. Tell me if it works.