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Old 01-04-2013, 12:07 AM   #6
Reedo302
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Join Date: Aug 2005
Location: Minnesota
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My Ride: F30 328i M Sport
^this, plus Mega and the custom billet stuff by companies like Seekins Precision.

All AR lowers are aluminum, unless they're the polymer or carbon-polymer versions. Stay away from non-aluminum AR receivers, both lower and upper.
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