American Spirit Arms' upper is a complete failure. I owned one for quite a while, got one of the first ones they sold and used it on a build. It is way over-engineered and just too complicated for it's own good. The idea is to make charging easier and quicker, they made it more complicated...
My father used to tell me stories about Vietnam where the Viet Cong was doing this to American ammo and leaving it around the bases. He said you never could tell who the enemy was, they all looked the same without the uniforms on.
He told me stories about how a few times they were required...
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