I'm told that AEG springs will fit into tri-shot shotguns, but I haven't tried this, myself. Apparently those things are a pain to take apart and work on. As for the tightbore, as I understand it, there are three separate "barrels" near the end of the outer barrel. I have no idea how you'd work that into inner barrels.
The only thing I've done to my SPAS (same system as the M3) is put a stock and a flashlight on it. You can also take apart the grip and/or stock to put in some weights for a heftier feel.
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