I have a new M3 Super 90, and the only things I want to add are mag extension and charging handle. I searched on this forum but didn't really find an answer, so I wrote Benelli and asked about parts interchangeability. The answer from them was that since they couldn't import the mag extension, they really couldn't say, but that "the magazine extension for the M1 might work".
So has anybody here tried it? And how about the larger bolt handles?
There are specific 2-shot mag extensions for the M3, but is that the older M3 or the Super 90?