Some Kahrs exhibit problems. So did Caracals, the first gen Remington R51, and many many others. My CW380 wasn't cleaned, has fired at least 150 rounds of Monarch steel cased ammo, and functions fine with Hornady American Gunner. I did it because I too had read of some guns being temperamental and requiring factory service. However - we only read of the bad cases on the internet, never the thousands of guns which are just fine. "Kahr" may not be the problem as much as your specific serial number. As you say, the 9mm one has functioned ok.
By all means send it back. However, "fears" of them being less that able to fix it aren't something we can address. I fear that there is far more emotional assessment going on than rational - after all, a firearm that exhibits symptoms that severe is an anomaly.
For the most part I stay away from Federal and Remington unless I want to practice stoppage drills. The weight of bullets is also an issue, and not just in Kahrs. As for the "extremely long" trigger pull, it's not a single action like the P938 or a cocked 4566 TSW, and it's been measured as 1/10 of an inch longer than a Glock - about right in the middle of most revolver pulls. Long is a matter of perspective and it sure feels a lot shorter than the RM380 - I passed on it as I didn't like having to pull that trigger back to the frame.
When you get it back, fire it with defense loads - the extra $2 a box isn't all that and since it's not a range gun for practice the costs are minimal over it's lifespan. As for it's eventual carry, base that decision on it's performance as you wish, however, letting emotion be the main factor won't let you arrive at a well thought out conclusion. We read of many shooters who make those decisions and swear off an entire brand forever - shoot long enough and later - maybe decades later - you discover that your favorite is now the goat on the market and the one you dislike has the best model. Ask Colt about it - Uncle Sam even gave the plans to FN to get better quality M16's issued. I personally trusted FN more than Colt during my service, and even a GM Hydramatic gave better reliability, basic training beater as it was.
If you go look for a bad reputation on the internet about a particular model, you will find it. There are dozens of posters who can't get their new $1100 1911 semi race carry pistols to function right out of the box, and what do we hear? "I sent it back, it's normal for these." We all agree it's not supposed to be normal, but there it is - makers do NOT extensively fire and exercise a gun before shipping. If Kahr put 200 rounds thru it first - it would be used, more than that, none of these makers are in that business. Gunbroker is. And we all know how that could turn out.
