On a budget, today, here's what I would do:

FN made CHF chrome lined barrel:

https://palmettostatearmory.com/psa...assic-ar15-upper-assembly-no-bcg-ch.html

Premium BCG, best I can tell they are rebranded Tool Craft:

https://palmettostatearmory.com/pal...m-full-auto-bolt-carrier-group-8779.html

You didn't use logic or reason to get into this opinion, I cannot use logic or reason to get you out of it.

You cannot over estimate the unimportance of nearly everything. John Maxwell