November 24, 2012, 11:10 AM
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#7
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Senior Member
Join Date: August 28, 2008
Location: Near Fairbanks Alaska
Posts: 829
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M4carbine.net is a great site for technical info.
Ar15armory is also, but it is more welcoming
to beginners. 
http://www.ar15armory.com/forums/AR15-Armory-f194.html
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