The best replacement for remington 870 is mossberg 500.

The best alternatives to remington 870 are rated as following:
★★★★★  mossberg 500
★★★★  mossberg 590
★★★★  benelli nova
★★★  887
★★★  benelli supernova
★★  mossberg
★★  mossberg 835
★  browning bps
★  winchester 1300
★  mossberg 590a1
★  mossberg 535
★  ithaca 37
★  benelli m4
  winchester sxp
  ithaca model 37
  winchester model 12
  nova
  stoeger
  benelli
  winchester defender
  winchester 1200
  weatherby pa-08
  remington 887

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Speaking about remington 870, one probably shouldn't forget about pistol grip.

Other search terms related to remington 870 and their ratings are:
★★★★★ pistol grip
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