I have a stripped upper and a complete AR. Both uppers are Anchor Hocking forgings. The upper on my rifle came from PSA. I hadn't realized how nice it was until I received the stripped upper. The stripped upper pins on to my lower without issue, however, there are some rough edges and not so neat machining. They are not all the same, though they should be compatible.
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22lr, 20 gauge, 8mm Mauser, 35 Remington, 30-06, 5.56x45/223, 9mm, 380acp
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