What I use
I have quite a few guns and will carry a larger one if my clothing and the situation allow - something like your Glock 23. But when I want a really small carry gun I use one of the two below, a S&W 642 revolver or a 9mm Kahr MK9. I use inside the waist band tuckable appendix holsters or a pocket holster. Both guns conceal quite well but give me 5 to 7 rounds of a reasonable self defense caliber for close range use.
I have quite a few guns and will carry a larger one if my clothing and the situation allow - something like your Glock 23. But when I want a really small carry gun I use one of the two below, a S&W 642 revolver or a 9mm Kahr MK9. I use inside the waist band tuckable appendix holsters or a pocket holster. Both guns conceal quite well but give me 5 to 7 rounds of a reasonable self defense caliber for close range use.