I take a Glock 26 for states where there are magazine restrictions, otherwise a Glock 19. The G26 makes it somewhat easier to dress around during the summer season, so that may also enter into consideration.

I might take a 642-1 to keep locked in the vehicle safe as a backup, (not on my person), but otherwise that gun is limited to duty within walking distance of my home.

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642-1, M&P15 TS