I would follow the advice here and just buy a complete rifle from DD, Colt, BCM, Rainier and even SW.
At the very least, buy a complete upper.
It's pretty easy to build a lower. Most people will only need a castle nut wrench for installing the receiver extension. Building an upper is a different story. Relatively easy to do, so long as you have the correct tools, but the tool investment can be a lot higher.
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