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Old January 11, 2013, 06:06 PM   #11
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Join Date: June 18, 2009
Location: NorthWest USA
Posts: 1,996
I've heard that Daniel Defense and S&W make most of the metal parts that go in their ARs, even springs and pins. They outsource the plastic parts. They are the exception though, most other AR builders outsource the metal parts too.

Definitely function test the upper and hopefully it will test out well.
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