Failure of Slide to Lock Back

[LProf]

During My first rang trip to start the break in process with my new CM 9, the slide failed to lock back on an empty mag the first three mags I shot.
I ultimately put 150 rounds through it, and it functioned flawlessly the rest of the session. The first three mags was the mag that came with the gun. I also shot a 7 round mag with no issues.

So, my question is whether i should consider the failure of the slide to lock back on those first three mags as part of the break in process, or view it as something
Moe serious?

I sine have acquired two more 6 round mags, but have not an opportunity to try them

[SickMAK90]

Mine did the same thing for the first couple of mags. Since then I have made sure I wasn't resting my thumb on the slide stop. I also had problems loading +1 at first, but those issues quickly remedied themselves.

I'd say it is just the ridiculously strong recoil spring needing broken in.

[Ikeo74]

^^^ I agree it is a combination of the strong recoil spring and weak target ammo. It will go away by itself after break-in.

[LProf]

Thanks. I will be putting the last 50 rounds of the 200 round break in tomorrow.

[wyntrout]

The 200 rounds is a suggestion. Some will find no problem in 200 rounds, but others may have problems past that point. Being broken in is the point where new, close tolerances have worn and mated so that there are no malfunctions caused by those rough surfaces.

Wynn:)

[cjive134]

During My first rang trip to start the break in process with my new CM 9, the slide failed to lock back on an empty mag the first three mags I shot.
I ultimately put 150 rounds through it, and it functioned flawlessly the rest of the session. The first three mags was the mag that came with the gun. I also shot a 7 round mag with no issues.

So, my question is whether i should consider the failure of the slide to lock back on those first three mags as part of the break in process, or view it as something
Moe serious?

I sine have acquired two more 6 round mags, but have not an opportunity to try them
My first range trip with my original CM9 was similar to yours. The first 3 or 4 mags failed to lock back on the last round, but then everything smoothed out and worked as advertised.

I will say that cycling the slide 500 times will help to prevent this from the start. I cycled mine about 200 times before my first range trip and I think this helped a great deal.

[jocko]

During My first rang trip to start the break in process with my new CM 9, the slide failed to lock back on an empty mag the first three mags I shot.
I ultimately put 150 rounds through it, and it functioned flawlessly the rest of the session. The first three mags was the mag that came with the gun. I also shot a 7 round mag with no issues.

So, my question is whether i should consider the failure of the slide to lock back on those first three mags as part of the break in process, or view it as something
Moe serious?

I sine have acquired two more 6 round mags, but have not an opportunity to try them

ur in the break in session, u have a new stout recoil spring in thegun that defiitely needs rounds out of the gun to get the recoil spring to take its designed set. More than likely to u were shooting fmj ammo and not +P defense stuff, which will work the slide faster and u would not have had any issues at the start even, . but that being said, using fmj normal amo is the best to break ithe gun in with. The fact that it is perfect now kinda proves to you that the gun is relaxing and smooothing out. It will even get better.

opefully u have read and looked at the kahr lube chart it is a dandy and also read the propper prepping thread.There are some tips there to look at in ur gun.

Nuttin beats rounds down range for getting a new gun right. Kahrs are tight when new and IMO they loosen up not alot, but they do smooth out alot. There is a difference..Keep shottin.

[Gandydancer]

Same problem with pm 45 clean oil liberally jhold round part of slide lock while cleaning gun and twirl like a noise maker on newyears eve. Easy to do even while at the range remove slide stop and oil and twirl problem has not occurred after breakin period

[sharpenit]

The 200 rounds is a suggestion. Some will find no problem in 200 rounds, but others may have problems past that point. Being broken in is the point where new, close tolerances have worn and mated so that there are no malfunctions caused by those rough surfaces.

Wynn:)

My CM9 didn't start working properly until I put 400 rounds through it (and after replacing the recoil spring and adjusting the bend in the slide-stop spring). Since then I've put more than 2,000 rounds through it without a problem.

[jocko]

Same problem with pm 45 clean oil liberally jhold round part of slide lock while cleaning gun and twirl like a noise maker on newyears eve. Easy to do even while at the range remove slide stop and oil and twirl problem has not occurred after breakin period

slide stops don't twirl..

[LProf]

The problem stopped after the first three mags. I now have put the 200 suggested break in rounds, all FMJ, and 3 mags of Speer Lawman JHP, with flawless functioning.

Could not be happier with the gun.

[Flincher]

I've had no malfunctions at all with my P380 ( close to 400 rounds). I closely followed the recommendations for clean, lube, and break-in found in the owners manual, on this forum, and several other websites found on Wyntrouts posts. Another thing I did (and still do), that I believe helped is while watching TV, I'll "dry-cycle" the slide hundreds of time. That little P380 is as smooth as butter.:):)

[wyntrout]

I only did a few dozen racks... usually with gloves on. I would rather fire the pistol. A FEW hundred racks won't hurt, though, but wearing gloves helps! I think 500 is insane, but to each his own....

Oh, and I vary the racks by trying to move the slide from side to side instead of just straight back... to increase the wear between parts.

The slide lock pin is very crucial to the pistol's operation. It can be easily damaged by incorrect insertion, so I encourage evryone to watch the Kahr take down and re-assembly video where emphasis is placed on this critical area. Either side of the spring can be damaged or bent, affecting the position of the slide lock and its actuator, causing early slide lock, no slide lock, or failures to feed and or ejection of the spent case.

With my P40, the screw holding the washer over the slide lock spring tends to work loose. I recognize that and re-tighten the screw... carefully... steel screw into plastic threads... EASY to strip them. I normally just use a bare Torx 6 bit with my fingers, but I do use the screwdriver handle sometimes, but I'm very careful... NO 1/4 turn more for good measure!:eek:

Wynn:D

[Flincher]

I've done enough racking (probably several hundred) to where the gun is SO smooth. But you are so right. After 50 or so I got smart and put in a tight fitting leather glove.

[tnedator]

After about 1,500 trouble free rounds with my PM9, I replaced the recoil spring. On my first trip to range after that, the slide failed to lock back multiple tunes on the six round magazine, but not on my two seven ribs magazines.

Doors this sounds like the recoil spring still needs some breaking in, or that I bent the slide stop spring? I don't think it's a follower problem, since my mags designated for carry don't have enough rounds through them to have a worn follower.

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