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Yes, the bushings accept standard 1911 thread grips screws, however the Norinco grip screw bushings themselves are a different thread than standard 1911 grip screw bushings where they screw into the frame.
Not sure why they did that but it is a bugger if you mess up a grip screw bushing & have to replace it.
Otherwise a Norc 1911 will accept standard grip screws, slot, hex or torx so you can swap out the crap grips they come with for something nice that bettter suits your taste....