I perfer to use a gun I dont mind handing over to the cops after it has been used and for that I use a Glock. I would hate to use a special gun that may sit in a evidence locker for months with fluids on it not being cleaned and getting rusted and a catalog number ground into it with an electric pencil.
I do keep a Mossberg 500 nearby and a revolver in the other end of the house just in case.
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We know exactly where one cow with Mad-cow-disease is located, among the millions and millions of cows in America, but we haven't got a clue where thousands of illegal immigrants and terrorists are