The best replacement for gas piston is direct impingement.

The best alternatives to gas piston are rated as following:
★★★★★  direct impingement
★★★  di
★★  gas impingement
★★  spring piston
★  blowback
★  gas tube
★  carbine
★  gas operated
★  nitro piston
★  gas block
★  direct gas
  impingement
  direct gas impingement
  standard ar

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