MK40 Recoil Spring Assembly Peened Over

[byrddogwi]

I have an MK40 which shoots good and has not malfunctioned from new. My recoil spring assembly gets peened over around the outer edge, see picture. I have had it replaced once by Kahr but after a few rounds it looks similar to the original.


(Link to the pictures)
https://flic.kr/p/qkDfdY


Does anyone else have this issue? It seems that it may eventually break off. I tried to attach a picture from flickr but it is not showing so I attached a link that can be clicked and viewed.

[ulflyer]

Just a WAG but it looks like it doesn't fit properly against the barrel part. What does that part of the barrel look like?

Did you send the whole gun back for the replacement, or just the previous recoil spring?

[berettabone]

I too would be interested in what the barrel looks like, where that rod end rests against........................................... ..........

[byrddogwi]

Thanks for the comments. I did not send it in to Kahr. When I spoke to someone at Kahr and sent them pictures of the original they sent me a new assembly and did not mention sending it in if it happened again. I just figured it was a bad one. I don't have anything to reference it to but the barrel looks OK. What do yours look like?

Here are some more pictures I took of it on the barrel and a picture of the end of the barrel where it rests. I took them with my cell phone so they may not be the best quality. The first 2 are the original assembly. The replacement is not quite as bad but it is also peening over on the edges.

https://www.flickr.com/photos/130381...57647723354484

[berettabone]

I have never seen anything like that. It's taking a beating for some reason. I would contact Kahr again. I have a MK9, so I can't compare, but that doesn't look normal to me. Are you continuing to put the assembly back in, the same way every time, or changing it's position, to see if it happens in one spot continuously, or if it's happening all around at the same time?

[gb6491]

When the top end is installed that end of the guide rod rests against the frame. What does the frame to the rear of the dust cover look like?
Regards,
Greg

[Redstate]

When the top end is installed that end of the guide rod rests against the frame. What does the frame to the rear of the dust cover look like?
Regards,
Greg

Excellent point, Greg. that's what I thought as well, but was not sure.

[Alfonse]

Maybe it needs new recoil springs. It looks like the springs may be hitting the end of travel.

[byrddogwi]

I added 2 more pictures of the area that I think you are asking about in the album. If that is not the right area let me know what area you want a picture of.

https://www.flickr.com/photos/130381...57647723354484

I don't see anything that does not look normal but I have nothing to compare it to. My other pistols by other manufacturers don't have this issue.

[gb6491]

I added 2 more pictures of the area that I think you are asking about in the album. If that is not the right area let me know what area you want a picture of.

https://www.flickr.com/photos/130381...57647723354484

I don't see anything that does not look normal but I have nothing to compare it to. My other pistols by other manufacturers don't have this issue.

I'm pretty much in the same boat as I don't have a metal frame Kahr to compare your photos to.
Still, I don't think the red highlighted material in the following photo should be there:

Hopefully somebody with a MK series Kahr can check this on their pistol.
Regards,
Greg

[berettabone]

I tried taking a decent pic with my lousy digital camera............great for the outdoors, not so much with closeups......................but I can say that if your pointing out the ridge or the material...........they are both also there on my MK9. I realize that he's shooting .40, but after roughly 800 rds. through mine, my frame has none of the wear that is showing on his. The slide stop hole, the "s" in the middle, and the right side of the frame look a bit choppy to me. The inside of the slide stop hole looks rough.

[Alfonse]

Here is a photo from my MK9 I just took:

MK9 Frame.jpg

And, if the .40 is like the 9mm, Greg is right, the material he highlighted is not on the MK9 pictured.

[byrddogwi]

I did not do a refresh and had not seen the 2 posts right away. I will try calling Kahr and reference the pictures in this post and see what they say. It seems mine is beating up the recoil spring assembly more than others. It would be nice to see if anyone with a MK40 could compare theirs. Maybe the .40 is a little harder on it than the 9mm?

[byrddogwi]

Alfonse, how old is your MK9? Did you paint yours or where there black coated models? Mine was purchased around June 2012.

[Alfonse]

Maybe Greg will weigh in here, but it looks like the machining for some reason is incorrect in that area. Rather than having a flat surface for the recoil guide to rest against, it appears to have that extra lip in there that may be causing the edge of the guide to get beat up. Kahr should be able to tell from your photo and Greg's enhanced version of it.