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I just installed one of the CZ rails on my CZ 527 Varmint Kevlar, and it is very well made. It gave me a lot more flexibility for mounting a scope on that rifle.
not sure if they would fit or not. i don't sell Norinco so I can't even try it out
They are Picatiny rails.
We have lots of spare CZ 452 mags in most if not all configurations.