re: Finally got her all put together. Rate my AR15 OB

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. It's a 16" barrel. 9-1 twist chrome lined.

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My bad. The long handguard played tricks on me and made me think it was longer.

I think either optic would be good. But one thing to think about - put an ACOG on there, and it is now twice the price of the rifle. Also be sure you look through an ACOG before buying - the eye relief is strange. But if the military trusts them, I'm sure they are durable and high quality, as is my personal RMR. Just make sure you know what you're dropping coin on.