Re-tasking the same AR-15 BCG in different uppers

Discussion in 'Gunsmithing and Repairs' started by Saw-Bones, Jan 12, 2016.

Thread Status:
Not open for further replies.
  1. Saw-Bones

    Saw-Bones Member

    Joined:
    Sep 3, 2014
    Messages:
    256
    Location:
    Florida in Winter * Deep South otherwise
    Are there any wear and/or reliability issues in using the same AR-15 bolt carrier group (.223/5.56/300BLK) in several different uppers manufactured by different companies?
     
  2. rcmodel

    rcmodel Member in memoriam

    Joined:
    Sep 17, 2007
    Messages:
    59,076
    Location:
    Eastern KS
    Probably not, but I don't think its a good idea.

    Bolt lugs wear in and mate to barrel extensions after a while.

    Then sticking the same bolt in a different barrel extension 'could' exert more pressure on one or more bolt lugs that were worn in and mated to a different barrel extension.

    But that's all theory on my part.
    I can't prove it, but I don't do it either.

    rc
     
  3. boom boom
    • Contributing Member

    boom boom Contributing Member

    Joined:
    Sep 24, 2007
    Messages:
    4,777
    Location:
    GA
    Could also have headspace problems because of tolerance stacking as well as what RC mentioned above regarding bolt wear. Precision is greater for AR barrel/bolt specs generally than something like a Mauser but it can happen that a particular bolt/barrel combo can either have headspace too short or too long.

    To correct the situation either requires trying a stock of different bolts to the barrel or the more expensive option of trying either to correct the headspace of the barrel which requires lathe work or having a stock of barrels to try to the bolt. That being said, most AR builders don't check for headspace or simply buy a headspaced checked bolt and barrel combo from the same source.
     
  4. esq_stu

    esq_stu Member

    Joined:
    Mar 30, 2005
    Messages:
    966
    Location:
    Michigan
    Maybe it's a bad idea, maybe not, maybe they average out, maybe not. I've got 5 BCGs, 4 complete uppers, parts for more. I don't commit any particular BCG to any particular upper. When I go to the range I pick a bolt and an upper and go. So far so good. (I store bolts separately from my guns.):eek:
     
  5. weaselfire

    weaselfire Member

    Joined:
    Jan 13, 2013
    Messages:
    56
    BCGs should work in any appropriate upper. That said, you can't tune an AR if you keep swapping parts around.

    Jeff
     
  6. dcloco

    dcloco Member

    Joined:
    Jan 31, 2006
    Messages:
    596
    The short answer...is no. Don't swap parts around.

    Would you swap bolts around in your bolt action rifle?
     
Thread Status:
Not open for further replies.
  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice