Is the Kahr MK9 Really a Pocket Carry Gun?
Yes, the MK9 is small enough for pocket carry. Though, that assumes you don't have disco-tight pants on and have sized them appropriately for pocket carry. That's right. Your clothing is key. Selected for the express purpose of pocket carry, certain pants will work; others won't no matter how good your disco steps are ...
The traditional hallmark concealable pocket gun is the S&W snubbie revolver. It's basic size is: 6.5" long, 5" high and 1.3" wide (at the widest point of the cylinder). Guns in this package can range from 12.8oz in the scandium/titanium flavors to ~25oz from some mfrs (ie, the Ruger SP101). A holstered unit will be somewhat larger, based on the fact that the leather must exceed the length of the barrel and must wrap around the cylinder. So, it'll be a bit longer and a tad wider.
Irrespective of weight, anything that size or smaller is generally equally concealable. It may flop due to the weight, but we're speaking of sizing, really.
So, that covers the following guns: CZ 2075 RAMI, Taurus Millennium Pro, Glock 19, H&K USP Compact (nearly), Springfield Micro Compact 1911, Colt Defender 1911, SIG P239, Walther P99 Compact or PPK, or any other similarly-sized gun. Of course, this assumes you select a good-quality pocket holster, one that's not appreciably "fatter" (around) than would be used on another gun from the list.
Assuming the pockets and covering garments are suitable, something up to a 3.5" barreled Officer's-framed 1911, snubbie revolver or typical "compact" offering from a number of mfrs should fit the bill.
Data point: I carried a S&W 442 Airweight .38spl snubbie revolver for years. In a well-designed pocket holster, the Springfield Micro Compact is about the same dimensions in the pocket as was the S&W 442. The KelTec P3AT 380 is half the width , one-third shorter and one-third less tall, by comparison. Now,
that's concealable.