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Old February 7, 2013, 06:37 PM   #2
Junior Member
Join Date: December 21, 2006
Posts: 11
You'll need a M16 BCG to run full auto

Your uppers need to have a "sear relief cut" to work with the M16 auto sear.
Do a google search on "m16 sear relief photo" to see the difference between an AR15 uppper and a M16 upper. You'll also need a large pin to small pin adapter if you AR15 uppers use the large pivot pin.
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