The best replacement for flatline is apex.

The best alternatives to flatline are rated as following:
★★★★★  apex
★★★★  sniper barrel
★★★  straightline
★★★  hammerhead
★★  apex 2
★★  apex barrel
★★  j&j ceramic
★  bt apex
★  straightline barrel
★  apex 2 barrel
★  16 barrel
★  flatline
  long barrel
  flat-line
  freak
  straight line
  lapco apex
  idmax
  a5 flatline

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flatline
apex
sniper barrel