+12.5-20% Critical Chance for 6s on successful Dodge.
+5-8 Bleed Stacks on Critical Hit.
Critical hit chance scales by your current heat level up to 27.5-50%. Also increases critical ranged attacks damage by 4-10%.
-30-60% Heat generation on Critical Hit.
Personal reference for best way to use this thing.
Crit and hit breakpoints as often as possible.
Delete big bads with shout buffs.