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Necron Canoptek Scarabs have Feeder Mandibles which auto wound on hit rolls of 6's. If their Circumstance of Awakening is Arise Against the Interlopers, they also get 6's to hit against Infantry and Bikes auto wound. Does this mean that a 6 to hit would generate two auto wounds, or are the abilities redundant?

They both say "an unmodified hit roll of 6 automatically wounds the target."

So they are redundant.