Not trying to be personal or insulting, just wanting to contribute. There are many people that know way more than I do. I would agree with the advice to stay away from Olympic Ar-15's. Not familiar with CMMG. I have had several DPMS and a few Bushmasters in my time, and they were all flawless with thousands of rounds. Not a single problem. The DPMS LAR-308 has a BIG following for their accuracy and build Quality. Which I own 2 of. Granted this is not out combat shooting, but shooting for fun with friends and family. In a combat situation, that reliability may change. But for fun and sub $1000 firearms you will be more than good to go.
The last one I bought I purchased a piece at a time and built it for just under $610.00. Free floating 16" barrel, Aero Precision upper and lower, M-16 bolt. Very pleased in its performance and accuracy. Only put around 800 rounds thru it so far. The Aero Precision stuff is good mil-spec quality. Fit and finish were impressive. If I remember correctly Spikes Tactical as well as other well known names have their uppers and lowers manufactured by Aero Precision.
Not many specialized tools needed and lots of free info on the net how to do it safely and correctly. Brownell's has a complete on-line video how to build your AR-15 from parts.
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