I received this upper earlier this week. Very nice to come home and its waiting for me vs. having to go to some FFL to pick up. Snapped it on a lower I had, really liking it. Built like a solid STHF piece, thinking I need to make the lower as durable. I am thinking a TN build using CMT ambi billet lower UHP-15A which I have on another build. Made in Lexington, TN. My concern is compatibility with a Maxim Defense pistol brace (will the rails hit the lower or the ambi controls on the right side).
