The best replacement for 39 is code 128.

The best alternatives to 39 are rated as following:
★★★★★  code 128
★★★  32 tv
★★★  50 34
★★★  .223
★★★  .308
★★  23
★★  128
★★  7.62 x 54
★★  7.62 x 51
★  ovidiani
★  polycarbonate lenses
★  pod 51
★  223
★  ovidiani translation
★  11 focus points
★  27
★  glock 36
★  fas 133
★  36
★  308
★  50/34
★  fas 115
★  orphan
★  128 barcode
★  .308 winchester
★  30-30
  7.62x 51
  300 blackout
  6.8 spc
  5.45 x 39
  stratus
  7.62 51
  54r
  let me in
  7.62 x 39
  7.62 x51
  53 39
  pe 89

Your alternative for 39 is not listed? Suggest!
Speaking about 39, one probably shouldn't forget about 11-28 cassette.

Other search terms related to 39 and their ratings are:
★★★★★ 11-28 cassette
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39
code 128
32 tv