Sorry, still having issues with nomenclature. Is this a feature common to a brand - Benneli, Browning, Beretta? I looked up the description and can see the advantage with autoloader. The 940 waterfowl instructions doesn't.
Are you talking about a limiting plug to reduce magazine capacity to 2 shells? I was told there was supposed to be one but when I took it out of the box to put on display (I worked in the gun store) there was not one in there. When I contacted Mossberg about how to gain access to the magazine...