I would follow Benelli's advice unless somone knows why you need not. One possible reason can be the size of the thread and th number of threads cut in the barrel or a characteristic of the barrel's metal. For some reason Benelli may be concerned that the greater shear force generaed by a slug passing though a chome may damage the threads cut in the barrel. I suggest contacting Benelli. It may be difficult to get an answer from them, but the good folks at Briley may know the answer.
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