I feel that I have to add another comment to this thread.
I have had many Norinco 1911's over the years. .45ACP , 9MM and converted one to 400 Corbon.
Norinco 1911's are noted for having very good steel and that all the holes are in the correct place.
Yes, they have metric grip screw bushings and yes, the sights are usually very tight in the dovetails.
And yes, the finish could be better.
I have changed numerous internal & external parts over the years & the drop in replacements fit
as well as they would going on to a Colt or other well know make.
I am not a gunsmith but my experience with Norinco's is that parts fit
as good as , or in some cases better , other quality 1911's.
Years ago before the U.S. banned the import of them , Bill Wilson of Wilson combat
would only work on 3 makes. Colt, Springfield & Norinco.
I recently bought a SAM frame to build a pistol. Gave up. Not even the mag catch
would go in.
Am I a fan of Norc 1911's ??. Yes. They work, a little rough around the edges but
that is why they cost less.