I have a two M2s (26 and 28) and use them for EVERYTHING, and have a serious problem with tinkering with anything that I buy. As far as modifications go, all the standards apply. Sighting options, HI VIZ, double dots, I even put a Burris Speed Bead on one of the guns. Theres a multitude of different charging handles that you can get, I probably have 6 different ones for the M2. Try Cactus Tactical, they should have some for you. I also have bought many different types of barrel clamps to go with the many different length mag extension tubes, my favorite were by Progressive Machine and Tool, really light and sleek, but VERY durable. Come to think of it they make the titanium charging handle that I like too. You can also get yourself the raised gel comb (chin) pad that Benelli makes, I have it on all my comfortech Benellis now. If you are really serious. I also switched out the benelli shell followers with teflon coated Nordic Components shell followers (you can get those at Cactus Tactical also). And one thing I didnt change, cause i am fine with it, is the speed button. But again, you can find multiple solutions out there to modify that as well. Hope all that atleast gets you started. Congrats on the M2 purchase, its the only gun you will ever need.