Can somebody explain to me or point me to a link that might explain this stuff? What is the difference between a pre-ban and post-ban upper? Can a pre-ban upper be put on a post-ban lower? Or vice versa?
That's what I thought. I just got a little confused when I see companies still selling uppers as pre-ban. Didn't make any sense to me as I am a relative newbie to this AR craze.
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