I've got three uppers in .22 LR, 9x19mm and .45 ACP for my Norinco. It shoots like a dream with cast!
Here it is with my .22 LR upper from STI.
Half STI, half Norinco. I call it...
...The Stinco!
:EDIT:
Imageshack seems to be down for this picture.
Here's a smaller version, unfortunately the only one I have at the moment: