Just completed my first project. I used a DPMS post-ban 223x5.56 lower. With the DPMS lower parts kit (Best deal at the local show). Now I need to finish the project but have not found that good of a deal on comlete full uppers at my local shows here in houston. Does anyone have a good source for a full upper for this DPMS lower. Looking for a good flat top 16" - 22" free float.

RRA has to be the best bargain in town...look at ADCO, or Pete in NH...great prices...I think they both have 3 or 4 uppers under $400 with shipping.  

I know the DPMS is a little more expensive, but have you thought about one of those? CMMG has 4 or 5 different DPMS uppers for $435.  

Also, don't be afraid to go J&T or M&A for an upper...although the savings isn't that big when you don't buy the whole kit.  

Unfortunatly, as far as I know, the only float tube RRA uses is on the varmint uppers...and they use a bull barrel for those.  I little on the heavy side for everyday use, IMHO.  

Best advice is narrow it down some, especially regarding length, and then start looking.