Colt A4 Upper (no BCG) $380.

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  • todbiker

    Ultimate Member
    Feb 11, 2012
    1,245
    Laurel, Maryland
    Fit to Mil Spec Lower?

    I seem to recall reading Colt using larger pins than other AR's???
    Would I run into any problems pairing this with pre-2013 non-colt mil spec lower?
     

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