Slim is the point of the Walther PPS M2. It is a single-stack 9mm with a 3.18 inch barrel and a 7-round magazine, and the frame is thin enough to disappear under a shirt. This one is used and in black.

The PPS has been a favorite for concealed carry for years. The M2 version updated the trigger and the grip, and it keeps the slim profile. The grip fits many hands, and the trigger is smooth and short. A single-stack pistol like this offers less capacity than a micro-compact, but it carries flatter.

Run the slide and check that the magazine seats well when you receive it. Walther builds a solid pistol, and a used one often has a lot of life left.

Seven rounds in the magazine is modest, so many owners carry a spare. Spare magazines are easy to find. If you want a thin carry gun with a reputation for reliability, the PPS M2 is worth a look. It is sold used and as described. It ships to your FFL dealer, and the background check is completed there.