This is the way to evolve a weapon... I would delete a Guardian and start a new one just to grow a Common to Uncommon to Rare to Legendary... having it end as an Exotic would just be cake on top of the icing of the cake sandwich....
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If Bungie did do it maybe on patch they send each character that hasn't got 1 a package with it that why we don't have to start over. Could the same template be applied to the strangers rifle??