Low ammo count obviously...given fusion rifles aren't real world...pretty sure you could low ammo LMGs
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That does'nt really fix the problem. The LMG would still be as simple as pointing it at the enemy to kill them. It would need to have it's ammo cut to the point where you could barely use it, and even then it would still strong because it would guarentee at least a few kills from short to medium range.