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BCM BCG came with an O ring...where does it go?

Discussion in 'Rifle Country' started by Leaky Waders, Apr 9, 2010.

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  1. Leaky Waders

    Leaky Waders Member

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    Hi,

    So I ordered a BCM upper so I can have a scoped AR and a Iron Sighted AR by just swapping uppers.

    The BCM bolt carrier group came with an oring...where does it go? Is it a spare or does it need applied before being fired?

    Pics of the new upper and old upper below.

    [​IMG]
     
  2. Zerodefect

    Zerodefect Member

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    Probally a spare oring. It goes around the extractor spring. It helps give the extrator more bite to pull the caseings out of a carbine.

    If you BCG came assembled, I'd assume its a spare.
     
  3. Gary G23

    Gary G23 Member

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    The BCM does not come with an O ring around the extractor spring. However, unless you have a carbine length gas system I would not put it in.
     
  4. briansmithwins

    briansmithwins Member

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    I've got BCM extractor upgrade kits in both the 16" middly and 20" rifle, with the o-ring.

    It doesn't seem like you can have too much extraction force with the AR.

    BSW
     
  5. Gary G23

    Gary G23 Member

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    My experience was different than briansmithwins. When I installed the BCM kit in my 16" middy it turned a previously 100% reliable gun into a jam-o-matic.
     
  6. Zerodefect

    Zerodefect Member

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  7. mp5a3

    mp5a3 Member

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    I use it in a 20" without issue
     
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