BCM Bolt Carrier Group (MPI) - Auto

Discussion in 'AR Talk' started by thisismyusername, Jun 3, 2009.

  1. thisismyusername

    thisismyusername XDTalk 1K Member Founding Member

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  2. Wayneard3413

    Wayneard3413 XDTalk 500 Member

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    And they are still there... Nice to see things are calming down a bit
     
  3. SRD

    SRD XDTalk 5K Member

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    just bought one.
     
  4. redyak3

    redyak3 XDTalk 500 Member

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    Good to see, I missed out on the last batch.
    Just got a LMT BCG on a notice from Ranier, so all is good.
     
  5. GaryXD

    GaryXD XDTalk 100 Member

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    out of stock
     
  6. thisismyusername

    thisismyusername XDTalk 1K Member Founding Member

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    Back in stock...
     
  7. BigMetal

    BigMetal XDTalk 100 Member Founding Member

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    man!! i've missed that three times! even with the email notification.
     
  8. BoltsFan

    BoltsFan XDTalk 100 Member Founding Member

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    Newbie questions.

    Why does it say (auto) I noticed they have a (semi) on their website.

    Does it have all components in it or do I still need to buy firing pin extracted etc?

    Thanks
     
  9. ForTehNguyen

    ForTehNguyen XDTalk 5K Member Founding Member

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    auto BCG are supposed to be more reliable than semi BCGs, bolt alone doesnt make it automatic
     
  10. 1911XD

    1911XD XDTalk 100 Member

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    The auto is an M-16 bolt carrier while the semi is the AR-15. The auto is preferred in the carbine variants do to the faster cyclic rate of the carbine gas system (the auto carrier is heavier). The higher pressure= faster cyclic which is harder on the bolt and may reduce reliability. The faster unlock time in the bolt causes increased centrifugal force on the extractor which could cause the extractor to slip off the case rim.

    Several things can be done to avoid this. A stronger extractor spring, auto carrier to increase the mass that is moved which will slow down the cyclic speed and heavier buffers.

    No (before you ask) it is not illegal to install an auto carrier in a semi auto rifle.

    BTW: the bolt is exactly the same, the carrier is different.

    Hope this helps!
     
  11. ScottyPotty

    ScottyPotty XDTalk 1K Member

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    The FA carrier does not make a AR15 any more reliable - its just heaver. and closer to/may be milspec which gives it cool points:wink:
     
  12. (AKA)Rusty Shackleford

    (AKA)Rusty Shackleford Guest

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    Excellent answer! That pretty much summed it up.....Oh by the way I was able to get one......"She-she-sshhaa" It will go well with my BCM middy......:mrgreen:
     
  13. mvician

    mvician XDTalk 5K Member Founding Member

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  14. (AKA)Rusty Shackleford

    (AKA)Rusty Shackleford Guest

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    [​IMG] :mrgreen:
     
  15. The DRis

    The DRis XDTalk 3K Member Founding Member

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    Love the lower I have that one. Waiting for a RRA LPK to come in stock somewhere and the money to buy it.

    And that laser engraved BCG has me thinking. BF (best friend since no one else can figure it out) is a manager at a engraving shop. Now if I can figure out what I want to put on there.

    The DRis
    Something cooler,
    Ideas guys?

     

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