Damages finish on uppers! built 2 aero precision uppers with this receiver vise block. - Vism Upper Receiver Block For Ar-15

I built 2 Aero precision uppers with this receiver vise block and it scratched/removed some of the anodizing on both of the uppers and even some off the vise block itself. Not impressed with the extremely tight tolerances in current spots and even misalignment when screwing in the chamber piece to the actual vise block, for mine there was a slight gap and feels like a cheaply made vise. Back pin is also super loose because of oval sized hole in the rear.