So I've gotten 4 Gjallarhorn in 2 days,
1 from Nightfall
1 from Gorgons chest and 1 from Atheon in the same raid.
Then 1 on my other character from level 34 PoE
Now that is lucky 3 on one hunter then 1 on the other hunter. Still have not done nightfall or any of the raids on my second hunter so who knows if that's the end.
http://i172.photobucket.com/albums/w5/mtulip91/image.jpg1_zpskvzhr9sc.jpg
http://i172.photobucket.com/albums/w5/mtulip91/Mobile%20Uploads/image_zps0oait0oe.jpg
[spoiler]sorry if you have not been lucky enough to 'earn' yours[/spoiler]
[spoiler]i already have 3 so there staying put in my postmasters inventory haha[/spoiler]
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You are very fortunate congratulations. Xur should sell it but will not.