I have the smallest Kahr 9mm and like it very much. It handles great and has been completely reliable.
I'll put in a vote for the Glock 42; surprisingly accurate, decent trigger and very concealable. Shown here with my other "mouse gun" a Kel-Tec P32.
View attachment 733369
No personal experience with their .380s, but I do have quite a bit of experience with the K9 and P45, as well as second-hand experience selling other models.
I really love my K9. It fits my hand like no other pistol I've ever held, but I quit carrying it regularly several years ago. The gun is exquisitely shootable, but part of that is due to the weight of the steel frame, which began to get a bit wearisome for regular carry.
Kahr trigger pull is really more like a very light double action than a typical striker-fired trigger. I personally find it very shootable.
Kahr states right up front in their owner's manuals that you should fire a couple hundred rounds through a new gun to break it in. I believe this is particularly important with their polymer frames, and as far as I can tell, all Kahr .380s are built on their polymer frame. It is normal during this process to get a few stoppages and to find the odd bit of black poly material when cleaning. The break-in process I suggest is to take 200-300 rounds of ammo and cleaning gear to the range. Strip, clean, and lubricate, then shoot a couple mags and clean it again. Then resume shooting. At any time you get a stoppage, quit shooting and clean and lube again.
Followed break-in instructions with my CW380 and no problems: this firearm flat disappears in a pocket holster.
The PM40 I refer to as "The Smallest with the Mostest!" loaded with the 140gr Lehigh Xtreme Defense or the 97gr Polycase ARX.
Cheers!
I have one. It's been completely reliable with any type of ball ammo, and completely unreliable with any type of hollow point. It's a great size to carry, but I don't. It's more of a tackle box gun.
I still own a CW9. I swapped out the magazine followers as recommended and that fixed the random loose round issue. I need to fit a flat faced trigger as the OEM piece does not work with my fingers. Recoil is low, but it should be given that I think the recoil spring would support a truck.