While I 'fess up to throwing a 380 Kel-Tec in my pocket during the summer at times. I usually try to carry the most effective pistol I can, comfortably.
These days, it's a SIG 365, before that, a 3rd Gen 3914.
I could carry something larger, with more capacity and a more powerful round, but not without sacrificing the comfort those smaller autos afford.
It's all about compromise when it comes to CCW, or we'd all be toting Desert Eagles and AutoMags.

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Because of the metric system?