I agree with telecom, regarding the extensions. They're not necessary once you get used to the gun. I shoot 295/300 on the full duty course with my baby glock all the time! They are great! They take just a little getting used to, having to shoot without the pinky finger.
The Kahrs are great guns. They come a little smaller than the baby glocks. However, they do not shoot as nice. They seem a little snappier than their glock counterparts. Great, reliable weapons. If you were to pick a reliable gun on size, alone, I would go with the Kahr.
Overall, I really like the glocks. Regarding your comment about 6 rounds being enough... well, I would agree, generally. What happens, however, when you have 2 assailants? I know you could what if it forever, but muggings, 7-11 robberies, etc. often work in pairs (at least). Will you be carrying a reload? Did you consider the G33 in .357sig?
A few things to think about.
We bring evil things to evil people, kicking in a door near you!
."In theory, there is no difference between theory and practice. But,
in practice, there is."
- Jan L.A. van de Snepscheut
"The difference between 'involvement' and 'commitment' is like
an eggs-and-ham breakfast: the chicken was 'involved' - the pig
was'committed'."
-unknown
Working on a PhD in CQB one doorway at a time.
When the wolf attacks, he will find not all who run with the flock are sheep!