Originally Posted by
MetalMike
Hmm that's odd, my non-restricted CSA VZ 58 is stamped 5.56 x 45. At any rate, you could measure the leade (distance to the rifling) in the chamber with an OAL tool (or other method) to see if it is a 223 rem or a 5.56. The leade difference is about twice as long in a 5.56. I know mine is good to go with cheap norinco milsurp :D
On a side note related to the thread, I haven't had a single malfunction in the 200 rounds or so I've put through it, mostly american eagle 55 gr fmj