With a Little Cleanup went right in.
With Any 1911 a little cleanup is always required for aftermarket sights to fit. That was also required here on the Dovetail edges of this rear sight. This rear sight brought my sight picture back to Factory specs as too shooting accuracy. Thanks guys you got it right on for Para-USA/Ordnance Mil spec type sight, the others I have don't come near and can't go back for refund because they had to be sanded to fit.