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The function of a buffer spring for the AR-15

Discussion in 'General Firearm Discussion' started by ravencrofte, Jan 4, 2016.

  1. ravencrofte

    ravencrofte portland Oregon Member

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    Does the buffer spring in an AR-15 only serve to push the bolt forwards once the spent shell has been ejected from the weapon? Are there other forces at work?
     
  2. 308

    308 ΜOΛΩΝ ΛΑΒΕ ΜOΛΩΝ ΛΑΒΕ Silver Supporter

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    The spring and buffer absorb the recoil energy by compressing rearwrd, then rebounding forward to strip and chamber a new round.

     
  3. rick benjamin

    rick benjamin USA, Or, Damascus Secure the drama Silver Supporter 2016 Volunteer

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    From FM 23-9, 2-1
    Functioning begins after a loaded magazine is inserted into the weapon.
    Feeding: As the bolt carrier moves rearward, it engages the buffer assembly and compresses the action spring into the lower receiver extension. When the bolt carrier group clears the top of the magazine, the expansion of the magazine spring forces the follower and a new round up into the path of the forward movement of the bolt. The expansion of the action spring sends the buffer assembly and bolt carrier group forward with enough force to strip a new round from the magazine.
     
  4. 308

    308 ΜOΛΩΝ ΛΑΒΕ ΜOΛΩΝ ΛΑΒΕ Silver Supporter

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    Also check out David Tubb's videos on flat wire recoil springs. He also talks about buffers as well.
    I run his flatwire springs on my ARs

     
    oli700 and jluck like this.
  5. Certaindeaf

    Certaindeaf SE Portland Well-Known Member

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    Yes. Mysterious forces. If you listen closely you can hear the "sproing" of mystery.
     
  6. Stomper

    Stomper Oceania Rising White Is The New Brown Silver Supporter

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    That noise is just the woodland gnome version of a bar-mitzvah.

    o_O
     
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  7. 308

    308 ΜOΛΩΝ ΛΑΒΕ ΜOΛΩΝ ΛΑΒΕ Silver Supporter

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    The flatwire pretty much eliminates that sound.
     
  8. Pandaz3

    Pandaz3 Cornelius, Oregon NRA Lifetime Member Platinum Supporter Gold Supporter Bronze Supporter

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    I have a JP Buffer assembly....No Sproing!
     
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  9. Velzey

    Velzey Estacada, Oregon Gunsmith Gunsmith Bronze Vendor Bronze Supporter

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    Coat that flat wire spring with grease and listen to any remaining sound disappear!!
     
  10. nehalemguy

    nehalemguy Vernonia Well-Known Member

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    But I like the "sproing". That's the sound of sweet, sweet freedom. :D

    E
     
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  11. Certaindeaf

    Certaindeaf SE Portland Well-Known Member

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    It's kinda like a cowboy playing a soothing jew's harp around the campfire.. but with gunfire. what's not to like
     
  12. Medic!

    Medic! What just happened? Has eagle eyes. But cant remember what he saw. Bronze Supporter

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    It supports and somewhat slows the buffer in it's rearward motion with the bolt carrier group.

    This may be why it's called a Buffer spring. Not a bolt carrier return spring. Which would make more sense. ;)
     
  13. Dyjital

    Dyjital Albany, Ore Flavorite Member Bronze Supporter

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    'Buffer'ing recoil
     
  14. clearconscience

    clearconscience Vancouver, WA Well-Known Member

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    I built an AR and the spring that came with the tube made the worst "Spronge!" Sounds everytime it fire. It drove me nuts! Traded all of them out for JP springs. Much happier.
     
  15. cmica

    cmica puy Active Member

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    just take it out and shoot
     
  16. Stomper

    Stomper Oceania Rising White Is The New Brown Silver Supporter

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    o_O
     
  17. slimer13

    slimer13 Deer Park Well-Known Member

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    I took mine out and that's now where I keep a tactical snickers bar. Works great and no sproing.