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I seem to remember reading about a few, can't bring the details to mind though. In both cases though there were people other than the shooter injured by "friendly fire" from the armed bystanders.
aggi-
I know its not relevant to the discussion at hand but I once saw a press helicopter video recording of an armed stand off in the suburbs of a US city.
There was one obviously very agitated man sitting on a plastic garden chair on a lawn with a pistol waving it around, threatening to shoot anybody who came near.
A police sniper shot the pistol out of his hand. Like in a shitty action movie. He took aim and actually shot the pistol on the side of the barrel causing the man to drop it and be arrested. How the man didn't get hurt I have no idea.
I don't even know where to start really. Doesn't strike me as sensible policing.
Stonehedge
With regards to "if only the good guys". Has there been a recorded incident of a non military/police affiliated individual taking down a potential mass shooter (difficult to assess I know)? Or stopping them midway through an attack?