I understand RNG, but I felt like I should share my experience in hopes that there isn't some kind of bug. I am SHD level 77, and have been farming like crazy, mostly challenging, but the last couple days Heroic. I have seen zero exotic other than the holster parts, of which I have seen about 5 times each piece. I sure hope there isn't something wrong, but again I felt like maybe sharing this because it seems out of wack a bit.