What difference between Kimber, SIG, Springfield Armories, Norinco, or dozens of other manufacturers over the years.
Copyrights for the 1911 pistol expired a hundred years ago.
Similar story with the AR-15, and a great many other guns.
The parts from my old Norinco 1911 work perfectly in my Colt 1943 GI pistol.
And vice versa.
They were made from the same drawings.
The Norinco 1911 steel, is better quality, than the wartime Colt gun.
Fit and especially finish varied widely over the years.
The current crop is pretty good.
Barrels are chrome lined and accurate.
Sights have improved, as have the triggers.
I love to build custom guns on a Norinco 1911 base.
probably because they "copied" some one else's design