AR Build Parts Supplier(s)
http://palmettostatearmory.com/index.php/ar-15-05.html
Have heard decent things about Palmetto State and thier branded items. Have bought from both PK and Aim, always good stuff and prices.
As for a complete upper look at the Rock River Arms, good, solid built accurate uppers, have two myself.
DSA is supposed to be good and has a decent rep.
Model 1 not good, have heard way too many bad things about them to ever trust their stuff.
Gunner
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https://www.instagram.com/41gunner/
41 Mags rule, Baers rock!
Complete thread:
- AR Build Parts Supplier(s) - 
RidinLou, 
2013-06-29, 11:31 
- AR Build Parts Supplier(s) - Gunner, 2013-06-29, 12:03
 - AR Build Parts Supplier(s) - Miles, 2013-06-29, 16:31
 - AR Build Parts Supplier(s) - Bob Hatfield, 2013-06-29, 18:37
 - Look at DSA Arms bravo Company Aimsurplus and CCMG - Rob Leahy, 2013-06-29, 23:11
 - Selections based on bullet wt - RidinLou, 2013-06-30, 12:21
 - Not so much specific vendors...... - John Meeker, 2013-06-30, 17:02