I have a K40 and shoot an MK once in a while. Holsters are plentiful for the Kahrs...whatever you want, you should be able to find. Pocket holsters are good for the MK.....
Ammo is plentiful also. The 3" barrel likes lighter rounds....135 gr hot loads, 155 or 165 gr JHP's ......see whats reasonable in your area and try it out.
I shot 155 Federal Classics last Sunday....HELLO! This is a basic JHP and proceeded to blow things apart better than 165 gr Gold Dots and 180 gr Talons.....my new Carry round.
Shoot well