Raid gear already has raid perks. I'd be against full set bonuses because it's put stats against cosmetics. Character customization is already on the weak side. I'd rather have a level system for weapon proficiency that boosts handling for specific weapon types, and levels up based on exp gained with that weapon type or kills. Maybe even put some kind of special perk for the final unlock like better accuracy (average distance the bullet deviates from point of aim, not AA) or stability.