Another vote for the Glock 19.
It's moderately concealable, accurate, the trigger can be fixed and mags hold 15 Rounds. Add a spare or two and you should be able to solve most problems of a social nature. Those you can't probably need a LOT more firepower.
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Fixed the triggers of all my Glocks in a matter of a couple of minutes each with McNally drop in trigger kit...not only fixed, they are now superb.