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Colt AR Uppers and Lowers

Discussion in 'General Firearm Discussion' started by duartfarquardt, Aug 5, 2012.

  1. duartfarquardt

    duartfarquardt Tigard, OR Active Member

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    I just acquired a Colt upper, post ban, with no bayonet lug, etc. I could care less about the bayonet lug, but I understand that some Colt ARs have small pins and some large pins. I need to acquire a lower that is compatible with my upper, and I THINK that I have a large pin upper. How can I tell, and how can I find a lower that is compatible? ANY advice is welcome.

    Duartfarquardt
     
  2. Redcap

    Redcap Lewis County, WA Well-Known Member

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    Measure the pin holes.
     
  3. Skang

    Skang WA Well-Known Member

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    they sell conversion pin also.
     
  4. duartfarquardt

    duartfarquardt Tigard, OR Active Member

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    I should have included that the pin holes measure 17/64 inch. Just a hair over 1/4".
     
  5. eldbillbo

    eldbillbo clackamas New world samurai and a redneck none the less Bronze Supporter

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    Small pin. you'll know cause it will be the same size hole that is on the rear lug

    so any lower will fit it except early colt lowers in which case you would need a $5-10 offset pin or bushing.