The best replacement for m4a1 is m16.

The best alternatives to m4a1 are rated as following:
★★★★★  m16
★★★★★  m4
★★★★  ak47
★★★★  acr
★★★  m4a4
★★★  m16a4
★★★  ar15
★★  acr mw3
★★  m4a2
★★  mosin
★★  m4a4 cs go
★★  scar h
★  ak 47
★  m4a1s
★  g36c
★  m4a3
★  scar mw3
★  ar 15
★  m16a2
★  m4 bf3
★  g36c mw3
★  g36
★  mosin dayz
★  m416
★  hk416
★  tar 21
  mk18
  scar bf3
  acr mw2
  m16a3
  m4 carbine
  scar l
  fad
  ak74
  m16a3 bf3
  scar h mw2
  l85a2
  m733
  m16a1

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