I need some thoughts on problems I'm having with my CM9.

I purchased the firearm a couple of months ago for my wife as her CCW. At the time of purchase I took the gun to the range and put 300 rds though it. (Let me preface this with saying I also ran a couple hundred dry-fire attempts prior to this initial range visit to help de-bur anything.)

100 - 115gr
100 - 124gr
50 - 147gr
50 - 124gr +P

I remember having a couple of failures to lock-back, and a couple of failures to feed that day, but nothing overly crazy or outside what I'd expect for a 1st day/break-in shooting. Accuracy was on par with what I expected.

When I got home that day I broke it down for a good cleaning, and came across my 1st issue. Namely, during re-assembly the slide would not fully go back over the frame to insert the slide stop/release lever. It would slide back across the rails for 90-95% of the distance, but then come to a complete stop with about 1/4" of the rear of the frame to go. No matter how hard I tried to remove/re-engage the slide it would stop before going fully back on the frame.I tried it with and without the trigger pulled back. 10 frustrating minutes later I was still trying to determine the problem when I accidentally pressed down on the top of the barrel just every so slightly as I put the slide on. This time it slid past the problem, and I was able to get the slide to the point needed to install the lever. Hmmm... I could re-create the problem, and found that putting downward pressure on the barrel while sliding it back would help. Not always, but I was at least more successful with getting the slide to fully seat on the frame. A week later she and I visited the range, and between the two of us we put an additional 100 rds of 115gr through the handgun. I recall a FTF or two while she was shooting, but I conceded that to possibly still be a "break-in" issue. Cleaning post shoot had the same results with difficulty in getting the slide fully back on the frame.

The Kahr went into the safe, and there it had been until this past weekend. My wife has since moved on to a different CCW solution, so I decided I'd give the Kahr a re-try to see if I'd like for my CCW..

I took 50 rds of S&B 115 gr with me to the range, and proceeded to get a gauge on the performance of the firearm. This time I once again had multiple failures to feed, and 1 failure to lock back. I have 2, 6 rd magazines, with the FTF's occurring while using both. Out of the 9 magazine loads ( 8 @ 6 rds, 1 @ 2rds), 5 had a FTF usually after the 1st or 2nd rd fired.

Thoughts on the potential issue? Still just break-in period expectations, or are these woes something that will probably require a phone call to Kahr?

ETA: spelling error

If the FTF's are happening on the 2nd or 3rd round, it sounds like the mag follower is binding on the mag catch window on the mag. You need to sand or reprofile the follower in that area where it is binding. There is a tutorial over at the Kahr forum.

Yeah, that is not follower related. Since the slide is locking back, are you sure your slide stop spring is not bent?

IMO, the Kahr slide stop spring is a design flaw. It is pretty easy to bend it upwards accidentally while reassembling the gun.