Your asks are being a bit schizophrenic.
Lets work backwards...
1 - what is your budget for the upper?
2- what are your must haves?
3- what would be your like to haves?
Based on what you have posted, I think you would be served well with a 16 inch, light weight profile that is free-floated.
Something like the Criterion Core barrel or the BCM Enhanced light weight (ELW) barrel.
Slap a PSA lower on it and it would be a fairly descent rifle. If you watch the sales, you can get a fully assembled PSA lower for around $130.
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