This is prob old news, but having just bought a CW380 I wanted a pinkie extension for the existing mag and an additional mag. Saw the 7rd one listed online for the CT and emailed Kahr if it would fit mine. Quick ans from "Jay" that it would so I ordered one, along with a pinkie extension for the mag that came with the gun. I liked the idea of having the extra protrusion from the mag to give my pinkie and back of my hand a bit more grip, and the extra bullet is just a bonus. I carry OWB so that little extra will make no difference.
Heading to gun show this weekend in Winston-Salem NC to find a holster and hopefully some more Defender round nose ammo. This reman ammo is made in NC seems to work well in the CW although I've only had a chance to fire 30 rds thru the new gun. A couple of hangups on first mag and one on the third mag and the rest performed as they should. The last I bought several weeks ago sold for about $13+ box, a good price in these parts.
I have some Blazer brass cased I want to try today to make sure it works in case I find some at the show at a decent price.
PS: Fired a box of Blazer without any malfunctions yesterday.