The best replacement for front sight is gunsite.

The best alternatives to front sight are rated as following:
★★★★★  gunsite
★★★  thunder ranch
★★★  flip up
★★  gas block
  a2 front sight
  tritium

Your alternative for front sight is not listed? Suggest!
Speaking about front sight, one probably shouldn't forget about eotech.

Other search terms related to front sight and their ratings are:
★★★★★ eotech
★★★ gas block
★★★ optics
★★ scope
★ red dot
acog
You have in mind a companion for front sight and it is not yet here? Propose!



Google Trends

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front sight
gunsite
thunder ranch