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Colt mag question

Discussion in 'GATE AR-15 Forum' started by IAMArms, Mar 24, 2011.

  1. IAMArms


    Feb 20, 2007
    SW PA
    I ran across some old mags for my AR. One is a colt and can only fit 5 rounds---however it is the same length as a standard 20 round mag. There is a 4 slot screw affixed to the bottom that does not allow it to move any further down. Anyone else ever seen one of these?