This is the deepest carry pistol I own. This one is on Gun Broker now, not mine.
Put in Pen Pistol in the search function at gun broker.
Can have it sticking out your shirt pocket, and no one would ever guess.
BATF does not like this handgun, and every maker that has tried to make it, is badgered into not making any more.
Mine is from American Derringer in Waco TX. Made in the early 90's.