One other thing, as this is your first AR, I don't know if you're aware of the need to keep the moving parts wet with lube, especially during break in. Make sure all the bearing surfaces are lubed, including a little on the buffer spring.
As far as the barrel break in procedure, do yourself a favor and skip it. Don't go nuts doing mag dumps or anything quite yet, but you can go 100 rounds between cleanings and it won't make the least bit of noticeable difference.
“You have made us for yourself, O Lord, and our heart is restless until it rests in you.” -Augustine
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