by shroud, you mean a can or aka a suppressor? most aeg can take them, i believe that the threads are 14mm standard, unless you get MK23 or B&T MP9, which you will need an adapter for it is bigger, well hopefully someone here is will give you better info, haven't research barrel shrouds on airsoft yet, just researching on how the make norc m4 to a honey badger .300
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