@Autodidactic has been kind enough to define what a "true" pocket pistol is for everyone, based on his pockets. Since we don't have the size of his pockets we'll have to use the dimensions one of his approved examples. Kahr PM9 - L 5.4'' - H 4'' - W .9" Glock 42 - L 5.9'' - H 4.1" - W .94 ("approved" size) Glock 43 - L 6.2'' - H 4.2'' - W 1.0 (This is deemed to big) Apparently less than 6'' long, 4.1 high and 1'' is officially a "true" pocket pistol. Lets see if we can get more 9mm "true" pocket size pistols other than the Kahr, based on the official defined dimensions. Beretta Nano - L 5.6'' - H 4.1'' - W .9'' Springfield Hellcat L 6'' - H 4'' - W 1'' (OMG it is official "true" pocket size) There ya go, now we have three 9mm pistols that meet the official approved dimensions of pocket size. And with 9mm we have more decent bullet options. What is decent? Well since Mr. Autodidactic kindly defined true pocket size, I'll define decent. At least 12'' penetration and consistent expansion (must meet both criteria) in heavy clothed gel. In 380 bullet options that meet both criteria are limited, hint you have about two choices: https://www.luckygunner.com/labs/self-defense-ammo-ballistic-tests/ By going with an "official" true size pocket 9mm your decent™ bullet options are much greater.