The best replacement for compensator is muzzle brake.

The best alternatives to compensator are rated as following:
★★★★★  muzzle brake
★★★  muzzle brake bf4
★★★  flash hider
★★★  suppressor
★★  flash suppressor
★★  porting
★  expansion joint
★  brake
  miculek
  battlecomp
  silencer
  muzzle break
  x-ring™ pac-lite® compensator

Your alternative for compensator is not listed? Suggest!
Speaking about compensator, one probably shouldn't forget about bushing.

Other search terms related to compensator and their ratings are:
★★★★★ bushing
You have in mind a companion for compensator and it is not yet here? Propose!



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compensator
muzzle brake
muzzle brake bf4