I'm actually a fan of the extremely high RoF auto-rifles, so I got one. Re-rolled it until I got most of the perks I wanted; Perfect Balance and Rangefinder, plus the Red Dot ORS1 sight, which is my favorite on this particular gun. It also has Cascade. I don't have it fully-upgraded yet, but I'm thinking that once I have it fully-upgraded, it'll be better than Necrochasm; the one I got has many of the same perks, but a larger magazine... and it's a Legendary, rather than an Exotic.