The best replacement for response trigger is e trigger.

The best alternatives to response trigger are rated as following:
★★★★★  e trigger
★★★★  e grip
★★★  e-grip
★  egrip
  e-trigger
  double trigger
  electronic trigger

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Speaking about response trigger, one probably shouldn't forget about double trigger.

Other search terms related to response trigger and their ratings are:
★★★★★ double trigger
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response trigger
e trigger
e grip