Primary weapons will have ammo. They will be 1.5x-2x stronger in damage with said ammo (As strong as they used to feel).
The upside is that once they run out of ammo, they have infinite ammo at the strength they are at currently. Until you pick up more primary ammo, of course.
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This guys when he looks at special and heavy weapon ... Nah bro ill plink my double primary build while wearing no exotic ! Thats gona work perfect !