556/223 subsonic

itchy300

August 31, 2015 13:33

Any good recipes that will cycle an AR?

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  cpermd

  August 31, 2015 16:44

  No
  Get a 22LR upper

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  tsr1965

  August 31, 2015 16:55

  Nope...not possible with the round you want to use. THe quickest way to get there is as has been suggested with a 22LR. The other fast alternative is the 300 Whisper/300 Blackout. Loaded with a 220 SMK you can get down to around 1050 FPS.

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  rufe-snow

  August 31, 2015 19:57

  AR's have a direct gas impingement mechanism. The only possible way I could see it working subsonically. Is by using the heaviest bullets available.
  
  Running from 77 to 90 grains. With the fastest twist barrel available, to stabilize them.
  
  You would also need one of the gas blocks with a built regulator, to adjust the gas pressure, so it wouldn't batter the BCG. But allow enough gas through to operate the mechanism.
  
  A lot of trial and error work ups, with various burning rate powders would be required. So that the load would be subsonic, but still function semi-automatically.

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  shooter10

  August 31, 2015 21:46

  There is a company that is in the Dallas area called Becks Ammunition (used to be Right to Bear Ammo), that makes 5.56 subsonic ammunition. It shoots through their subsonic 5.56 upper. I buy all my subsonic 308 and 300 Blackout from them and it has all been excellent. Great web site.

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