I wonder if since this is rotational play if it is due to the fact that it's a 9mm upper.
I have minimal expereince with 9mm uppers, but aren't they blow back with no gas tube? I wonder if the lack of gas tube is allowing the handguards to rotate slightly?
Are 9mm standard handguards any different than 5.56 standard handguards?
Like I said I have very minimal experience with the 9mm AR, and may be WAY off base here.
-RD62


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