Check out brownells. They sell the medium weight JP barrel with adj. gas block, bolt, and brake. The price really is not too much more than going the route you are thinking (I just recently priced out the same thing). If you check brownells on a 10% off deal you can save quite a bit. What you are planning is a solid build (I almost went that same route) but you can get into something even nicer for a little bit more.
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