Kill HVT hive gaurdians and do all deepsight events.
Thats how i got them.
The gaurdians always drop 1 weapon guarenteed.
And the 2 weekly activities also ALWAYS drop a weapon.
(The activity where you need to do 2 puzzles and then kill a boss)
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The HVT was the way i eventually got it. I also put on my Ghost Public Defender. Most likely placebo but after hours of non dropping i got all i needed within 30 mins of putting on public defender.