I don't have it yet but videos are out. What we know: 0 stack: 450 rpm 1 stack: 600 rpm 2 stack: 600 rpm 3 stack: 720 rpm We also know the damage is DECREASED from normal 450 auto rifles as the rof increases. - For example, 1 stack of Rampage will actually DECREASE your damage, not increase it like you would think. You're doing less damage per shot with 1 stack of Rampage than you do with no Rampage, but the rpm jumps to 600. - At 2 stacks, the RPM stays at 600 but the damage goes up. - At 3 stacks the damage stays the same but the rpm jumps to 720. My hypothesis: Breakneck 0 stack = 450 auto. Breakneck 1 stack = 600 auto with 1 stack of Rampage. Breakneck 2 stack = 600 auto with 2 stacks of Rampage. Breakneck 3 stack = 720 auto with 3 stacks of Rampage. My hypothesis is that all the Breakneck perk does is change the archetype. It's possible, and I hope, the damage is slightly better than my hypothesis, but we know for sure the damage is not normal 450 auto rifle damage as the rof scales up. (That would probably break PvP anyway)