I have owned Norinco weaponry and have found it to be more than satisfactory. Many will say the chinese steel is weaker and prone to peening over use; I never experienced that. In my opinion, Norinco made very good products.
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im a fan of norinco firearms, statements above pretty much says it all.
as far as the sig copy, i dont think they were ever imported to the u.s but like other norincos we have here in the u.s, i would think they are well built
and after googling this issue last night i have found that norinco clones are indeed very good and intact
thought original sig's finish is tougher
but the frame of the norinco np-22 according to some threads
is stronger than the original sig's
that the rail wont crack as some threads complain about the original sig's