I bought the ka40 with the blue finish when they first came out.This was a replacement for my old chiefs special as a backup/offduty gun.The K40 handles like a full size pistol but is about the same size as a PPK.
I have had zero malfunctions with Federal Hydra-Shok(180gr) and Speer Gold Dot(180gr) factory ammo.We were forced to use some very crappy locally made reloads for practice and qualification.The Kahr did not like them with failures to chamber being the norm,they seem to have tight chambers,but with a clean gun and factory ammo run flawlessly.
My only gripe about the gun is the blue finish is not very durable or rust resistant.Kahr nolonger makes this version,but I prefer blue/black finishs.
I really like how this gun is built,old school=forgings and milled from bar stock parts.The full sized Kahrs feel solid,like your shooting a full sized gun.It is easy to field strip and clean.
I normally despise DOA actions on auto-pistols,but the Kahr is one of the few exceptions.It is very smooth and feels lighter than the rated 8 lbs.I shoot the K40 better than the old J-frame.Even though the K40 weighs the same as my SIG duty gun,it doesnt feel like a big gun in a proper holster,I use Uncle Mike body armor holster and a Milt Sparks Executive Companion.
I feel these guns are very underrated and real sleepers.The K9 is a real pussycat to shoot if you dont like the K40s brisker recoil.