I farmed this for over a month, FAITHFULLY, everyday, 5 hours daily, every minute. I quit playing because it was not fun anymore farming all the time for a weapon I wanted like so many others had. I was so disgusted with a month of farming 5 hours a day and having seen only 7.
Some people were walking out and getting them done in two days. I had one friend get his for, it doesnt matter. He did little time and got it quite fast.

I came back after 2.4 and now here I am again for days, farming for the last five. I spend 4 hours now and yesterday 8 and still have yet to see a single one of the five I have remaining. If one more person asks if I have the weapon equipped or if I am in the right zone, I'll scream.
This drop rate sure hasn't helped me, not in the slightest.