T127, you have a good plan so far. And Cookie5 gave good advice. Your own lower topped with a BCM or Daniel Defense upper is a darn good way to go. Or if you're on a budget, a PSA upper is a lot of bang for the buck. I have all three uppers on lowers I put together and all function well. The PSA plus my lower, an MBUS2, a PMAG and sling came in around $700 last year - definitely mucho bang for the buck!
I would suggest a 16" midlength LW/pencil barrel over the M4 profile stretched to 16".
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