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When one installs a heavy (Krieger, Douglas, Obermyer, etc) NM barrel on the Norc / Springfield receiver, all you need to ensure is that the threads on the gas cylinder lock and the castle nut are the USGI/American threads. Norc receive owners have likely figured this out already.
Your Norc/Chinese gas cylinder will fit and so will your flash suppressor. In the past, my friends who have had these installations done have been super happy!