Buffer tube

Discussion in 'AR Talk' started by GatGatGat, Oct 29, 2007.

  1. GatGatGat

    GatGatGat XDTalk 100 Member

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    potentially dumb question... how do i determine what type of buffertube i have, commercial or mil spec? i accidentally purchased a magpul buttpad for the CTR (in my defense item only said ar15 buttpad with a small pic)which is fine since i was planning on gettin the CTR anyway, problem only being if i get the comm version it comes with the buttpad...
    so how do i know which to get??? thanks in advance

     
  2. mvician

    mvician XDTalk 5K Member Founding Member

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    calipers ? :p

    Bushmaster uses commercial sized receiver extensions
     
  3. GatGatGat

    GatGatGat XDTalk 100 Member

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    quick response, but bummer
     
  4. ajamesp51

    ajamesp51 Official Site Vendor Supporting Vendor

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    Everyone like Rock River uses commercial. Only Colt/FN or Military contract uses the smaller tube.
    The inside diameter is the same so you dont have to worry about the buffer or spring. The walls of the
    commwerical are thicker so the out side diameter is larger except for the threads that attach it to the reciver,
    the threads are the same.
     
  5. John A.

    John A. XDTalk 3K Member

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    +1

    Couldn't have said it better myself. Thanks for saving me all the typing.
     
  6. ScottyPotty

    ScottyPotty XDTalk 1K Member

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    I know stag, CMT, LMT and I think DPMS, CMMG use mil spec buffer tubes.

    What you need to do is measure the outside diameters. Then do a Internet search to find the exact measurements.

    What brand rifle do you have?
     
  7. nsnate02

    nsnate02 XDTalk 1K Member

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    It's real easy, if the BT is the same size as the threads - Commercial. If it has a shoulder and then tapers down immediately after the threads - mil-spec. about 90% of the BT are commercial.
     
  8. yocan

    yocan XDTalk 10K Member Founding Member

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    Explain this to me please? WHY IS THE MIL SPEC THINNER?
     
  9. mvician

    mvician XDTalk 5K Member Founding Member

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    everything you ever wanted to know :D

    http://www.m4carbine.net/showthread.php?t=101

     

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