Can't wrap my head around this malfunction (CM9)

[SteveG]

So after getting it as an early Christmas present I finally got some range time with my CM9. First observation is I shoot the diminutive Kahr better than my Glock 19, that was surprising but I've heard Kahr pistols are wicked accurate. I did have one problem though, a few times when the last round fed the gun either wasn't resetting the striker or it was decocking somehow. either way I'd pull the trigger and there was nothing there. Not unheard of based on what I'm reading here, but what I isolated as the cause may be. I traced the malfunction to one single 6 round magazine. I had two other 6 round and two 8 round mags and they all worked fine. Put that one in and it would not go bang on the last round. I'm hoping Kahr will exchange the magazine for me, but I'm wondering if there is something else I should check out too.

[berettabone]

You might want to check the spring in the mag that's giving you trouble, and see if it has been installed correctly. Don't know what that would have to do with the striker problem, though. Possibly, the last round wasn't being loaded, hence pulling the trigger, and nothing happening.

[SteveG]

You might want to check the spring in the mag that's giving you trouble, and see if it has been installed correctly. Don't know what that would have to do with the striker problem, though. Possibly, the last round wasn't being loaded, hence pulling the trigger, and nothing happening.

oops forgot to mention that it is chambering the last round. It just isn't reset to fire it.

[Bawanna]

I for the live of me can't figure how the magazine would have any influence on the striker setting or not.

I'm still working this in my head and others wiser than I will no doubt be along shortly. Narrowing it down to one magazine is a big clue, but the clue doesn't mean anything to me at the moment.

Color me pondering.

[muggsy]

So after getting it as an early Christmas present I finally got some range time with my CM9. First observation is I shoot the diminutive Kahr better than my Glock 19, that was surprising but I've heard Kahr pistols are wicked accurate. I did have one problem though, a few times when the last round fed the gun either wasn't resetting the striker or it was decocking somehow. either way I'd pull the trigger and there was nothing there. Not unheard of based on what I'm reading here, but what I isolated as the cause may be. I traced the malfunction to one single 6 round magazine. I had two other 6 round and two 8 round mags and they all worked fine. Put that one in and it would not go bang on the last round. I'm hoping Kahr will exchange the magazine for me, but I'm wondering if there is something else I should check out too.

Did you check to see if the gun went fully into battery on the last round? If not the trigger won't engage.

[SteveG]

Did you check to see if the gun went fully into battery on the last round? If not the trigger won't engage.

Fully into battery every single time.

[Bawanna]

That was a good thought though Muggsy. Might have been a good possibility.

Close but no cigar for you mr.

Back to pondering.

[berettabone]

Dirty striker channel and coincidence???????????????????????????

[jocko]

my 21 cewnts

I for the live of me can't figure how the magazine would have any influence on the striker setting or not.

I'm still working this in my head and others wiser than I will no doubt be along shortly. Narrowing it down to one magazine is a big clue, but the clue doesn't mean anything to me at the moment.

Color me pondering.

u can get a dead trigger if the rund that feeds into the chamber is to long and it holds the slide back an cuntess hair. Might not be noticeable even but it then sends the entiere trigger mechanishm into no mans land and it will produce a dead trigger. Not saying this is the issue as most of the time it seems tobe an out od spec trigger bar, but again that is part of thge trigger system. We have seen rounds OAL and even jammed into the rifling and the shooter not knowing it, as the slide seems to go to full battery when indeed it is a tad out of spec. Doesn't take much, IMO.

Just my 21 cents on this. I cold be wrong but as most here know I am normally never wrong:86::86::86:

[SteveG]

u can get a dead trigger if the rund that feeds into the chamber is to long and it holds the slide back an cuntess hair. Might not be noticeable even but it then sends the entiere trigger mechanishm into no mans land and it will produce a dead trigger. Not saying this is the issue as most of the time it seems tobe an out od spec trigger bar, but again that is part of thge trigger system. We have seen rounds OAL and even jammed into the rifling and the shooter not knowing it, as the slide seems to go to full battery when indeed it is a tad out of spec. Doesn't take much, IMO.

Just my 21 cents on this. I cold be wrong but as most here know I am normally never wrong:86::86::86:

Possible, but it'd be a heck of a coincidence. For the last 42 rounds I fired at the range here is what I did:

Load 2 rounds each into each of the six round mags (3)

Chamber a round using the slide release fire two shots

Only one magazine would fire, feed and give me a dead trigger. Pull the slide back just enough to verify a round in the chamber and it would fire no problem. This happened 7 for 7 after I suspected it was a magazine.

[Bawanna]

That's good info right there. It fired the second try every time. So that mag is slowing things up or something on the last round, and it's just not quite going into battery, apparently extremely close.
When you chamber check your getting it home and it works.

I'd be looking at the follower, and the feed lips. See if there is any roughness or anything that would slow the feed down. Same with the follower.

Take that one apart and make sure the spring is correct and check the follower for freedom of movement up and down the mag tube.

To confirm this theory, I'd do just what you did with the two rounds in the bad mag. Load two, fire the one and let the second chamber, then take your hand and smack the back of the slide and see if it goes bang the first time. If it does we're golden and need to address that mag, if not, we're back to the drawing board.

[SteveG]

That's good info right there. It fired the second try every time. So that mag is slowing things up or something on the last round, and it's just not quite going into battery, apparently extremely close.
When you chamber check your getting it home and it works.

I'd be looking at the follower, and the feed lips. See if there is any roughness or anything that would slow the feed down. Same with the follower.

Take that one apart and make sure the spring is correct and check the follower for freedom of movement up and down the mag tube.

To confirm this theory, I'd do just what you did with the two rounds in the bad mag. Load two, fire the one and let the second chamber, then take your hand and smack the back of the slide and see if it goes bang the first time. If it does we're golden and need to address that mag, if not, we're back to the drawing board.

OK I'll give that a try, though range time may not be for another six weeks. Wrapping up my Masters Degree so I might be a bit busy.

[mickeyfinn]

wrapping your head around something

i've never understood the phrase "wrap my head around (something).

it's probably more painful than "keeping an eye peeled."

[SteveG]

i've never understood the phrase "wrap my head around (something).

it's probably more painful than "keeping an eye peeled."

It greatly depends. Wrapping your head around a perplexing problem is one thing. Wrapping your head around a steel beam is another.

Having tried (not intentionally) both I wouldn't recommend the steel beam.

[7ekken]

mine had same problem from magazine 1 all the way through 275 break in rounds... sent it to Kahr and they adjusted/fixed trigger bar.

last round would chamber but trigger wouldn't reset unless I hit on the rear or bottom of the pistol.
made no difference if the mag was loaded with 2 or a full 6.

although it was disappointing this happened the very first day of ownership, Kahr took great care of my pistol and properly fixed my CM9.

on a side note...I did go through the proper prep of a new Kahr the same day I picked her up prior to range time