The best replacement for a1 is a2 milk.

The best alternatives to a1 are rated as following:
★★★★★  a2 milk
★★★★  a2 stock
★★★★  a2
★★  a2 flash hider
★  m1
★  heinz 57
★  f1
★  a2 ar 15
★  m6
★  57
  a2 ar15
  a1 sportback
  r1c1
  ae1
  mini
  hd a2
  hd xa1
  westlife
  e5 aluminum
  d32 d33 awards
  worcestershire
  xl2
  d32 d33
  xh a1s
  d32 33
  a68
  hdr fx7
  b1
  a3
  a0 size
  1 series
  a0
  m16 a2
  sony hdr fx1000
  xa1
  hvx200
  590
  canon xh a1s
  1911 a2
  hp sauce
  tf101 b1
  panasonic ag hmc150
  s1
  sony hvr v1

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a1
a2 milk
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