The 4th Horseman is bugged again. In the Official Bungie Destiny app, the weapon's name is CLASSIFIED, its type is CLASSIFIED, and it can't be transferred off a character.
The bug-ness wasn't there last night PDT; I only noticed it starting this AM (Thursday).
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Same on my end... shows as classified on the app, does not show at all on the Bungie website, however you can take it from the vault in game only if you go to the tower. Outside of that the weapon still works.