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AR15.COM
AR Sponsor
7/2/2009 9:42:34 PM EDT
Can i mount any 6.8 upper on my standard ar-15 lower receiver or do i have to get a .308 lower?
7/3/2009 2:41:05 AM EDT
[#1]
Drop it on your lower, place the proper mag in the mag well and blast away....

You do not need a different lower....
AR Sponsor