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Posted: 11/19/2008 12:43:36 PM EDT
I am considering building an AR10.  I have heard the parts aren't "interchangeable" like those on a .223.

Can anyone shed some light on the problems I would run into here?
Link Posted: 11/19/2008 5:03:49 PM EDT
i have seen uppers with an angle near the rear takedown pins and others (non armalite) with a radius.
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