Black Spindle is based around getting headshots. Final round only procs when you get a headshot. Mulligan is a crappy perk. Black Spindle would be way more effective with Final Round.
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Adding final round would increase the dps capabilities and it would turn into a year 2 g horn on the forums, a lot of people would be left out of raids simply because they don't have one or don't want to use one. You can do just fine on dos without one but a lot of people think it's a necessary right now the way it is