The best replacement for m400 is 516.

The best alternatives to m400 are rated as following:
★★★★★  516
★★★★  6920
★★★  le6920
★★★  bushmaster
★★  556
★★  m&p 15
★★  colt 6920
★  m600
★  m12
★  sig 556
★  colt le6920
★  sig 516
  mp15
  rm400
  m200
  colt ar15

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m400
516
6920