The best replacement for 6920 is 6940.

The best alternatives to 6920 are rated as following:
★★★★★  6940
★★★★  6721
★★★  sig 556
★★★  6921
★★★  daniel defense
★★  6720
★★  sig m400
★★  m400
★  6940 colt
★  m&p 15
★  rock river
★  lmt
★  6900
★  colt 6940
★  6933
★  6400
  noveske n4
  spikes tactical
  le 6920
  lmt defender
  ruger sr556
  ddm4

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Speaking about 6920, one probably shouldn't forget about magpul accessories.

Other search terms related to 6920 and their ratings are:
★★★★★ magpul accessories
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