A friend of mine has a Chinese made 84S-1 and I am trying to find him some magazines for it. It is 5.56x45 (.223). If anyone knows where please let me know. Also, would an m-16 magazine fit?
M16 and AK mags are completely different. An M16 mag will not fit in your friend's AK.
There are plenty of AK mags in .223. Just google AK74 mag.
I would recommend getting the steel ones though. They are more expensive and less common than the polymer mags, but in my experience, function better and are more durable.