Unlock Location & Farm Method:
As far as we know, 
Frangible does not have a designated drop location. Instead, you'll just have to farm away and hope you get it as a random World Drop.
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Frangible
Submachine Gun
Daedalus
Legendary
Unique Ability
[An amalgamation of licensed part effects]
About
Rarity
Legendary
Manufacturer
Daedalus
Weapon Type
Submachine Gun
In-Game
How To Get
Frangible Guide
Learn more about Tips and Tricks for the Frangible SMG