Just wanted to make a mention that the Revision Zero Exotic pulse rifle released in Season of the Seraph appears to be currently unobtainable, as is the same with its associated intrinsic upgrades, perks, stocks, and catalysts. I acquired the rifle and the Hunter's Trace II intrinsic last season but none of the others and as such, there appears to be no way to acquire the remaining intrinsic upgrades and catalysts. It's worth mentioning - I am assuming the weapon itself isn't obtainable because it's not available in the Exotic kiosk, and being able to craft it requires a red border version of the base weapon which seems like it would've only been obtainable last season. In terms of the intrinsic and catalyst upgrades though - there is no way they can be equipped, and the sources in-game point towards last season's 'Should You Choose to Accept It' quest.