Just noticed that my Year 2 exotic Invective Shotgun, after fully upgrading and unlocking the perk to regen ammo over time, isn't regenerating any ammo. Both in crucible and in PvE modes, when the clip is empty, full or if there is absolutely no ammo left in my special.
And to add insult to injury, a 2nd special exotic Engram turned into an invective whilst the first is still in my inventory.
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Is it worth using? Just got it out of a 3coins engram this morning.