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Old November 15, 2012, 04:12 PM   #7
RickB
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Join Date: March 1, 2000
Location: Western WA
Posts: 5,665
And I addressed that part of the question. Colt has used non-standard pin sizes and some internal dimensions over the years, so you can't always swap non-Colt uppers and lowers. Doing so staved-off "assault weapon" legislation for twenty years, but Colt gets nothing but grief for it, now.
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