Theoretically, if they did make a 5.56 export version for the 191, where would the mag release go? The trigger guard seems to be too far forward to make a mag release easy to access.
AK201 Kilashnikov concern modernized AK101 chambered 5.56x45mm NATO.
Note the AK style magazine.
G36 Heckler and Koch 5.56x45mm NATO
Standard issue Germany, Spain and more.
Note the non STANAG Magazine. With tab style latch.
Galil Ace 22 IWI 5.56x45mm NATO.
Note STANAG magazine well on a rifle that has iterations that also accept AK magazine in other calibers.
These are three options if Norinco and China wants to make a derivative of the QBZ191 in 5.56x45mm/.223.
1) modify 5.8x42mm magazine or use AK101 /Ak201 magazines. Not impossible the round already fits the basic form of the magazine body it would need perhaps a change in curve but it’s fairly easy and frankly fairly common in commercial market for nonstandard ammo in an established weapon series. For example a number of 7.62x39mm or 5.45x39mm commercial AR15 use modified AR magazine or magazines with an AR15 magazine profile.
2) design a new magazine and well that are a bit of a hybrid. G36 and Sig 550 are examples of this. They have wells closer to STANAG but not interchangeable with it using an AK style tab.
3) a separate receiver with modified well to accommodate STANAG. The Chinese did this though arguably a bit of a cludge in the Type 97. Another version of this option is….
3.5) Design a modular lower receiver group that has a magazine well modules that could be swapped out and meet different magazine profiles. The G36 kinda has that option it’s just not used militarily. A number of commercial AR also have it again not used in wide military service.