The best replacement for mil is moa.

The best alternatives to mil are rated as following:
★★★★★  moa
★★★★  mm
★★★  micron
★★  gauge
★  millimeter
★  mill
★  mic
★  mrad
★  thou
★  moa scope
★  6 mil
★  no mil
  5 mil
  gauge thickness
  mil
  1 4 moa
  gmb
  6 mil plastic
  18 mil
  civ
  2 mil
  30 mil

Your alternative for mil is not listed? Suggest!
Speaking about mil, one probably shouldn't forget about sil.

Other search terms related to mil and their ratings are:
★★★★★ sil
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mil
moa
mm