Enumeration is a 
Ripper SMG.
Its special effect is Finite Set - Reloading refunds 50% of the magazine's spent ammo.
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How to Unlock The Legendary Enumeration SMG
Weapons
Legendary Loot
Overview
How To Unlock
Unlock Location:
- Progress through the Bounty Pack 5: Amara and the Vile Shadows DLC until reaching the Optional Boss The Reject Prototype.
Farm Method:
- Defeat The Reject Prototype to get a chance at the Enumeration.
- After use the Encore Machine nearby to reset the fight.
- Repeatedly defeat The Reject Prototype until the Enumeration drops.