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Fast Hands
Critical hits add a stack of 4% reload speed bonus. Max stack is 40.
Multiple critical hits only increase the stack by 1.
Since Striker and Heartbreaker can increase stacks per shotshell pellet, Fast Hands should do the same.
https://drive.google.com/file/d/1zIVn_fhk8Uoeaief1k90JSUsi2oC9D8t/view?usp=sharing: (https://drive.google.com/file/d/1zIVn_fhk8Uoeaief1k90JSUsi2oC9D8t/view?usp=sharing)