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I remember a couple years ago when I asked about fitting the CZ Kadet kit to a Norinco copy of the CZ85 (NZ-85B or NP-40) someone on here said that it doesn't fit. I didn't take it any further so you can still hope they were wrong.
My Colt .22 conversion unit will go on my Colt frames, my 1911A1 USGI frames, and a SA 1911A1 frame I have. But it won't go on any of the Norinco 1911A1 frames that I've had over the years.
The 22 conversion kit top end would fit on the NP29 frame. Your problem will be the 22 mags becouse the NP29 is a double stack mag. Someone made a kit that allowed single stack mags to be put in a double stack gun but cannot remember who.
BIG MISTAKE SORRY
The NP29 is single stack and the 22 conversion fits. I should know I have one and the 22 conversion Works great just had to do some minor fitting