They would have to literally double all the rare guns and armour in the game because rares and legendaries are separate items. There probably isnt enough space for it but the idea is excellent
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Well I don't know anything about programming really but couldn't they like have things organized in groups and whatever they throw in that group is automatically classified as "rare" or "legendary" so all it would take is a copy paste from the rare group to the legendary? But yes, it's quite a good idea, would allow a lot more variety.