As we all know the story of the FAF pulse rifle, but recently it was added to the Armory and Grimoire pages. I wonder why, maybe it will be obtainable? or maybe they wanted the rest of us to be able to see the gun without having to inspect that one player.
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It's pretty obvious. They changed it to jade rabbit, the reason it's still in grimoire is because it still exists in the game (just only one person has it) I'm sure he has the grimoire unlocked for it.