The best replacement for reflex is red dot.

The best alternatives to reflex are rated as following:
★★★★★  red dot
★★  reaction
★★  sensa trac
★★  instinct
★★  sensatrac
★  red dot sight
★  holographic sight
★  eotech
★  red dot black ops
★  alive
★  havoc
★  untamed
★  commuter otterbox
★  holographic
★  holographic sights
★  hoyt
★  reflux
★  reflex
★  psychogenic
★  helix
★  commuter
★  optimum nutrition
★  reflex arc
  maximuscle
  response
  acog
  tube red dot
  red dot cod
  compacta
  reaction time
  realflight
  acoustic suspension
  gas magnum
  red dot call of duty
  infantile spasm
  bilstein
  usn
  red dot site
  burgman
  rds
  point and shoot
  reflect
  rancho rsx
  red dot scope
  silverwing
  atv

Your alternative for reflex is not listed? Suggest!
Speaking about reflex, one probably shouldn't forget about mental distraction.

Other search terms related to reflex and their ratings are:
★★★★★ mental distraction
★★★★★ jendrassik maneuver
★★ realflight controller
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Google Trends

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reflex
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