I have two Adams Arms carbine length uppers on two different lowers. You are going to love the way they shoot and the minimal cleanup after a day at the range. Word of warning... Don't be stingy with the lube while you're breaking it in!
I put Troy flip up battle sights front and rear on both and have a Leupold Mark AR scope on one and a Leupold Mark 1 3x9 on the other.
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