You see a lot of questions on the net/forums about which gun to buy, what caliber, style (revolver vs semi-auto), etc. For example: 9mm or .40S&W Here is an interesting blog post that might give you a different point of view on HOW to select a gun. (see the related posts at the bottom for more info) Considerations when selecting a gun for defensive purposes - Part 1 | Down Range TV Regarding POWER in the article, keep this in mind: