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  #1  
Old 11-23-2009, 01:35 PM
jdmac44
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Default Premature slide lock

I have a Kahr MK9 that has a tendency for the slide to lock back prematurely, before the magazine is empty. It will even do this with my arm and wrist locked out (I'm 6'3", 230 lbs, so I don't have a problem holding it firmly). I realized that the slide retention lever's spring wasn't pressing down as much as I thought it should and so I reasoned that the lever must be flipping up with the recoil. I contacted support and they sent me a new spring (thank you!), but the spring they sent me was the wrong one (oops!). So rather than go through that again, I took the original spring out and gently bent it so that it would press the lever down more firmly. I finally was able to get to the range last week and I had the same problem, it was raining so I didn't put a lot of rounds through, but it locked back on me once in two magazines. Any other ideas? Oh yes, and it will do this with standard pressure el cheapo FMJ rounds as well as high quality high pressure JHP rounds. If all else fails, I'm going to buy an extra slide retention lever and file down the bit that holds the slide back! A few compact guns down even offer slide lock, so why not?
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Old 11-24-2009, 08:54 AM
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jocko jocko is offline
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u are probably on the right track. About the only other thing that can cause premature slide lock is one of those rounds is hitting inside the slide lever, and there fore engaging it.

Take ur slide off, insert the slide lock lever and then insert a loaded magazine and see what that top round is doing on the left side. Is it hitting theat slide lock lever??If so you should see very easily that lever going upward when you insert a loaded magazine. If so callkahr and get a new slide lock lever from them. I would doubt if it would be that little spring thing, for its design is to always to be pulling the slide lock lever down ward and never upard. Only the magazine follower moves the slide lock upward.

Be very sure your thumb is possably not engaging that slide lock lever also. A good test is to shoot it left handed to see. Normally the MK9 will shoot anything that goes into the pipe. My bet is a faulty out of spec slide lock lever. Please keep us posted on how you resolved this...
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Old 11-24-2009, 01:35 PM
jdmac44
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Cool thanks, I'll check it out and get back to you! I have been watching my thumb, but I hadn't thought of anything interfering on the inside.

The toughest thing about this is getting to a range around here to test the latest theory. The closest ones are 45 minutes away, I let my membership lapse at mine when I thought I was going to move out of state and so I have to go with a buddy to one of theirs, when they have time to go. Some only allow you to join in the spring, some have closed membership because of the rush of new gun owners due to our new administration, then there's the indoor range that charges $15 an hour.
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Old 11-24-2009, 04:08 PM
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Default the thumb

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Originally Posted by jdmac44 View Post
Cool thanks, I'll check it out and get back to you! I have been watching my thumb, but I hadn't thought of anything interfering on the inside.

The toughest thing about this is getting to a range around here to test the latest theory. The closest ones are 45 minutes away, I let my membership lapse at mine when I thought I was going to move out of state and so I have to go with a buddy to one of theirs, when they have time to go. Some only allow you to join in the spring, some have closed membership because of the rush of new gun owners due to our new administration, then there's the indoor range that charges $15 an hour.
thing indeed requires you to do some shooting witht he left hand to check that part out but the rounds hitting the slide stop on the inside you can check right in home to see if it is happening.

to my knowledge that is the only two things that can cause the slide stop to engage without permission, your thumb hitting it and u not knowing it or the slide stop is being hit by the bullet on the inside as it comes up in the magazine.
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Old 11-24-2009, 06:42 PM
jdmac44
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Okay, I just checked and the rounds do not interfere with the lever at all. I looked at my grip and I naturally do not keep my thumb anywhere near the lever. I looked a little more closely at the spring with the slide off and the slide stop lever in and noticed that the spring wasn't even making contact with the lever for a couple of millimeters, which as I had already noticed before gave enough play for the lever to go up and catch the slide. I've bent the spring down to the point where it actually contacts the lever and now there is very little play, it is controlled by the spring. I almost made a YouTube video to demonstrate but I already bent the spring, so I think it's best to leave it. I think you know what I mean. I won't be able to test it immediately, but I hope to soon, maybe once it finally stops raining and soaking the local ranges for awhile.

Thanks for your help! I'll report back once I'm able to shoot again.
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Old 11-25-2009, 02:55 AM
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I bet u fixed the issue. that little springhy thing has to make contact as u noticed. Nice job jdmac...
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  #7  
Old 11-25-2009, 09:20 AM
jdmac44
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I think so! Thanks for your help, I don't know why I didn't think to remove the slide and put the slide stop lever back in. That helped immensely to see what what going on in there. Sometimes I get tunnel vision on these things. Thanks for your help.

I need to go to the range and rebuild my confidence in my weapon! lol
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  #8  
Old 03-17-2011, 10:52 AM
Speedy Speedy is offline
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Im having the same problems with my MK9.
Its about a 8 months old. I put maybe 400 rounds thru it and it still locks the slide with ammo still in the magazines! :O
Shot with my left hand, still does it,
checked the mag to see if the ammo was touching. NOPE (it comes very close but does not touch).
I've even tried different ammo and still nothing helps.
Any Advice?
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Old 03-17-2011, 11:03 AM
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DO WHAT JDM44 DID TO HIS SLIDE STOP SPRING.

Only 3 things can cause a paremaute slide stop engagement.

#1, thumbs hitting it
#2 bullets hitting on the insde of the slide stop lever causing it
#3 weak or bent slide stop lever spring, causing to much freeplay

nothing else can cause that. eliminate the possables

Also go to the kahr tech section and hit on the propper prepping of your new kahr, it addresses this little spring thing to and how to adjust. also go to gb6491 sticky on the kahr tech section of cw45 issues. he has some excellent photos of what this little springhy should look like if all is right. My thoughts are tha tyour slide stop lever has to much free play and needs that little springhy tweeked..
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  #10  
Old 03-17-2011, 11:12 AM
Speedy Speedy is offline
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oh, sorry, forgot to mention that. spring is nice and firm.
i'll check the prepping of the kahr ( i remember reading something about 10 steps to prepping or something like that a while back. i remember watching tv and racking the slide 500x's lmao)
cool, thanks man, i will check out those pics of gb9491
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