create adept weapon we already farmed out (or reed's regret which for me is still not dropping with any usable perks on adept)
or re-roll 1 perk for the weapon for 1 ascendant shard
re-roll the entire weapon for 1 ascendant shard
or change 1 perk to a specific one for 10 ascendant shard.
any of these should be fine for me.
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Rerolling basically killed the grind in destiny 1. If everyone has the perfect gun, no need to keep playing. Bungie wants us to keep chasing guns.