And having a gun. I know 2 guys (brothers) who carry, one bought a .357 sig full sized glock, one a j frame lightweight. Guess who always had his gun, and guess who only carried in winter? A glock 30 may kick bad, its not the caliber, its how well you place shots with it. Ill keep .45 for full sized guns, 9mm is enough for carry. For civilian self defense, with modern JHP, there isn;t much difference in calibers. For LEOs, who need to fire at bad guys through cover, windshields, etc, i think .45, which maintains mass through barriers, is a much better choice.
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