Colt A2

Discussion in 'AR-15 Discussion' started by ianmagerl, Feb 15, 2012.

  1. ianmagerl

    ianmagerl New Member

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    Looking for a new upper assembly for a colt a2, curious about what would or wouldn't be compatible.
    I tried putting the upper from my rra lar15 flat top assembly onto the colt lower. the only difference is the take down pins the colt has a pin in the back like my rra. the front has a pin with a bolt inside of it though. Would there be a certain type of upper I would have to buy?
    Thank you for your patience to my ignorance.
     
  2. fsted2a

    fsted2a Active Member

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    I believe that you're front pin is from an SP1, not an A2. Unless the upper or lower are out of spec, there shouldn't be a problem matching the two.
     

  3. Jpyle

    Jpyle New Member

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    Some older Colt receivers used a bigger pivot and takedown pin set, ie "large pin colt." The bolt may have been a bubba workaround. You should first determine the pin diameter on the lower and locate an upper to match.
     
  4. ianmagerl

    ianmagerl New Member

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    Many thanks, the "large pin" term helped me find some better info. they make retro fit pins for them.
     
  5. Quentin

    Quentin New Member

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    Daniel Defense may still offer a large pin upper for older Colt lowers. Or you can find conversion pins to mate a small pin upper.
     
  6. locutus

    locutus Well-Known Member Supporter

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  7. ianmagerl

    ianmagerl New Member

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