Revision Zero Catalysts
The Revision Zero has 4 catalysts that are unlocked by completing the Operation: Seraph Shield on Legend difficulty. There used to be a quest for these catalysts but now you unlock them through the exotic mission rotator.
Exotic Perks for each Catalyst:
4-Timer Refit: Rapidly landing precision hits will return two rounds to the magazine.
Frenzy Refit: Each rapid kill with this weapon progressively increases reload speed for a short time.
Outlaw Refit: Precision kills greatly decrease reload time.
Pressurized Refit: Improved stability and accuracy as the magazine gets lower.