Well if haven't all ready bought the upper you should look at the 7.62x40. It is the 5.56 trimmed back to 40 mm and open up to 7.62 so it is very reliable in the AR platform.
If you handload brass is cheap.
https://www.wilsoncombat.com/7-62x40-wt-rifles/
As for scopes the Burris Fullfield II 2-7x35 is an excellent one.
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"For exercise I recommend vigorous walking... and carrying a gun. The gun’s weight will increase the level of exercise and the possession of a gun on a walk produces real confidence."
Thomas Jefferson
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