The best replacement for ar-15 is m4.

The best alternatives to ar-15 are rated as following:
★★★★★  m4
★★★★  ak-47
★★★★  ar-10
★★  mini 14
★★  shotgun
★★  ak-74
★  m1a
★  sks
★  m-16
  sig 556

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ar-15
m4
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