I do not agree with the above......your not likely to hang a bunch of shit of your shotgun and if you do it doesnt matter the M2 still works fine......I have had lights, slings, side saddle and a T1 mounted....the M2 does not skip a beat......Benelli has perfected the inertia system, when was the last time you heard of major jams with the M1/M2........The benelli inertia driven shotguns are considered the best for a reason. I would stick with the M2 as it is a lighter package.
To answer your question, yes I dont see why it would not be possible to go from the tactical barrel to say a hunting barrel.....its all the same. As far as the stocks I have the tactical pistol grip on my M2 currently and I own the standard comfortech stock if I feel like swaping it out....they all work, if its Marked M2 is should work.