WHAT??
the usgi flashider and ALL other components of a usgi rifle will and should fit right onto a norinco rifle. with the exception of..... connector lock pin..... gas cylinder lock ring..... and flash hider castlenut. ( and of course the bolts must be lapped in)
the connector lock pins are bigger diameter than the norc... slightly (this is the pin that retains your oprod spring and guide.
and in the norinco barrel situation.... if you use a usgi flash hider.... you must reuse your norinco castlenut
same goes for gas assembly.... you re use your norc gas lock