The best replacement for sig 556 is ar 15.

The best alternatives to sig 556 are rated as following:
★★★★★  ar 15
★★★  516
★★  scar
★★  m4
★★  xcr
★  m400
★  551
★  acr
★  m&p 15
★  ruger 556
★  arsenal ak
★  ruger sr 556
★  bushmaster acr
★  hk416
★  sig 516
★  mini 14
★  ar-15
★  colt 6920
★  ar15
★  ruger
  robinson xcr
  scar 16
  fn scar
  lwrc
  ruger sr556
  lwrc m6a2
  sr 556
  colt ar 15
  hk 416
  colt le6920

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sig 556
ar 15
516