What are some essential self-defense/home security devices?

So I live in an apartment in a rough neighborhood and would feel safer if I had some self defense weapons and/or a alarm system. What are some good weapons? I probably want one gun(yeah, its that bad). What gun would be the best. Shotgun or pistol? What brand? And what alarm system would you recommend? Also, should... show more So I live in an apartment in a rough neighborhood and would feel safer if I had some self defense weapons and/or a alarm system. What are some good weapons? I probably want one gun(yeah, its that bad). What gun would be the best. Shotgun or pistol? What brand? And what alarm system would you recommend? Also, should I get a taser or pepper spray? Thanks
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