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I have a couple AR's in 9mm and haven't experienced very precise accuracy. The 16" one groups the best at around 2.5"-3" at 100 yards. These were assembled uppers, not exactly premium units but I kind of expected a little better. I'm using scopes with crosshairs, not a large red dot that covers the target. I've used premium ammo as well as jhp stuff, both are comparable. Is anyone getting even close to MOA? I know it's a pistol round but some of my scopes pistols group far better.