I love the Norinco 1911. I hate the Norinco 1911 mags. Mine went into the garbage after one trip to the range.
Get any other quality brand of mag: Wilson, Kimber, Colt, Shooting Star.
I am even willing to bet that anyone who dislikes their Norinco 1911 after shooting it is because they tried the factory mags instead of good magazines.
As mentioned, try the EE first if not Cabelas and Wholesale Sports plus many of the sponsoring organizations sell good magazines.
By the way, those grips DarkSyd recommended are awesome. I might have to get a set of the roped ivory.