Originally Posted by
themighty9mm
It coulda been a Monday or Friday gun. Check to make sure the RIS 2 is aligned properly, and everything is square. Beyond that about your only possibility, is something on the rifle is not in spec or loose barrel. Perhaps you were resting the muzzle device on a sand bag? And you said multiple people were having the same issue?
Loose barrel is not likely if all shots are grouping to the left. I think most likely the rail just is not squared up. If that's the case loosen all 6 screws, place a carry handle rear sight or other optic mount bridging the upper receiver and rail. Then retighten the screws in a like you would lug nuts on a wheel