This is my experience as well. Even a PSA upper/ 18" SS barrel that I assembled with some care and attention on an Aero lower shoots 77 SMK's and TMK's reliably under an inch for 5, right around an inch for 10 at 100.The AR is the tikka of ARs. It’s a sound design and as long as you have a decent free-floated barrel and good trigger you’re there.