The best replacement for extended mags is dual mags.

The best alternatives to extended mags are rated as following:
★★★★★  dual mags
★★  variable zoom
★★  scavenger
★★  scavenger pro
★  rapid fire
  grip

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Speaking about extended mags, one probably shouldn't forget about scar h.

Other search terms related to extended mags and their ratings are:
★★★★★ scar h
★★★★ rpd
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extended mags
dual mags
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