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i would never consider getting a 9mm. that's the exact gun that won't go thru walls and kill your neighbors. i also would not consider a short barreled shotgun, the shorter the barrel the less distance you can get from it, granted, most gunfights happen within 20 feet.

i'd recommend a revolver with the caliber being in the 30's or 40's, that's stopping power. a 9mm is like having a bunch of roman candles, you could empty an entire magazine into someone and they wouldn't fall down until you had about 3 bullets left (speaking on the beretta of course)