Hive disruptor was removed so white nail perk would work correctly. Until Bungie fix the problem you wont be able to fully upgrade your black hammer
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My black hammer has the gold box outline
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Ya, it will be 2017 before that is fixed, Bungie announced that 1 weapon per year is hardly possible with all of the events and updates they give us monthly...
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I noticed this with Necrochasm also
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I have the same problem. The first Blackhammer I got fully upgraded fine, so I guess the removal of Hive disruptor was patched after this, my other two maxed out Blackhammers I levelled up recently both have the issue raised above.