I own five (Six) ARs. 1/4 MOA AR-15 (Noveske), lightweight AR-15 14.5" build, heavy weight 300 BO hunting 16.5", AR-10, and now the AR-9, I also have a pistol lower AR-15. As I said in the OP this is for public range plinking with my 9mm Glocks.
This is a dead horse argument, but modern 9mm loads are ballistically effective, and the higher capacity and ease of shooting, is why pretty much everyone is switching to 9mm.
9mm easily passes the FBIs penetration test.
Check out IV8888's YT videos on how far can a 9mm kill.
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