Critical Decay is a 
Torgue Pistol
Its special effect is Decay - 30% Chance to attach a Torgue Sticky whenever an enemy receives Radiation Status Effect Damage.
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How to Unlock The Legendary Critical Decay Torgue Pistol
Weapons
Legendary Loot
Overview
How To Unlock
Unlock Location:
- Progress through the (FL4k And The Last Resort) DLC until reaching the Boss
Logistics Manager Reyes
Farm Method:
- Defeat Logistics Manager Reyes to get a chance at the Critical Decay.
- After use the Encore Machine nearby to reset the fight.
- Repeatedly defeat Logistics Manager Reyes until the drops Critical Decay.