How do you know what type of buffer you need/want

Discussion in 'AR Talk' started by yocan, Feb 20, 2011.

  1. yocan

    yocan XDTalk 10K Member Founding Member

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    So out of curiousity how do you know what type of buffer you have/need. I know M4 buffers are shorter correct? But beyond that I read on the army review of the m4 that certain buffer swap made it much more reliable. So umm if I am getting a used ar15 how do I know the type of buffer should be in there.

    On top of that how do I know what type of buffer is ideal for 6.5 grendel? I have no idea.
     
  2. MPDC

    MPDC XDTalk 500 Member

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  3. ryr8828

    ryr8828 XDTalk 3K Member

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    You need a carbine buffer and spring for a collapsible stock and a rifle length buffer and spring for a rifle stock. Then you can play with the weights of the particular length buffers according to your barrel length. You might want a heavier or lighter buffer in that length for your rifle.

    Here's some talk about 6.5 grendel buffers, I don't own one and know nothing about them.

    http://www.xdtalk.com/forums/ar-talk/155102-any-6-5-grendel-gurus-out-here.html
     
  4. Deadcenter

    Deadcenter XDTalk 3K Member Founding Member

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    [​IMG]

    This chart shows the desired ejection patterns. You can play with your buffer weights / spring combo to achieve it.
     
  5. f150baja

    f150baja XDTalk 100 Member

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    deadcenter, very nice chart. mine is perfect.
     
  6. Mercmar

    Mercmar XDTalk 5K Member

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    I've found that chart to be absurdly incorrect. The ejection pattern between 12 & 3 that shows a heavier buffer or M16 carrier recommended is exactly backwards. When I install an M16 carrier in any of my ARs, I get the 12-to-3 (mostly about 1:30) ejection pattern. Going back to the lighter AR carrier, which SPEEDS UP the action, makes for a more positive, correct ejection pattern. It's really simple h.s. physics. Whoever drew up that chart probably never took h.s. physics or failed, if they did. :cool:
     

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