The best replacement for m2 is m4.

The best alternatives to m2 are rated as following:
★★★★★  m4
★★★  vinci
★★★  micro sd
★★  m1
★★  montefeltro
★  m3 pmag
★  sq m
★  microsd
★  m4 bmw
★  ft2
★  m1 license
★  m3 browning
★  square m
★  sbe
★  m235i
★  d2 steel
★  s1
★  square feet
  sbe 2
  m1 money supply
  super black eagle
  sq ft
  d1
  monetary base
  sbe ii
  m3 leica
  d2
  cordoba
  sbe2
  300 cd m2
  sx3
  dsc m1
  winchester sx3
  memory stick micro
  m42
  maxus
  t2
  mx2
  beretta 391
  391

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Google Trends

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m2
m4
vinci