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AR15 converting 9mm to .223

Discussion in 'Rifle Country' started by Lightsped, Feb 20, 2006.

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  1. Lightsped

    Lightsped Member

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    I have an Olympic Arms AR15 chambered in 9mm. I would like to buy an .223 upper (complete).

    Besides the upper, barrel, charging handle, and bolt carrier is there anything else I would need? Will a .223 upper simply "plug and play" into my 9mm AR15?

    [​IMG]
     
  2. AZ Jeff

    AZ Jeff Member

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    IIRC, I think the hammer is different between the 5.56 and 9x19 versions of the AR, and may need to be swapped to get it to run right.
     
  3. CleverNickname

    CleverNickname Member

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    The 9mm-style hammer (which is basically an M16 hammer without the hook for the autosear) will work with 9mm and 5.56mm. The 5.56mm style hammer with the notch in the hammer face will only work with 5.56mm.
     
  4. Lightsped

    Lightsped Member

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    So if I understand correctly, as far as hammers go, my 9mm hammer will work with .223/5.56? Anything else of concern before I go looking for a .223/5.56 upper?
     
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