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Thread: 1500 rounds and first problem since breakin.

  1. #11
    Join Date
    Feb 2014
    Posts
    163

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    Quote Originally Posted by bugs View Post
    FWIW, I always heard that cycles are what weakens springs; my CM9 has 6500/7000 cycles during its' practice / competition life time, so far on the original factory recoil & 6/7 rd.mag springs, and still preforms robustly. perhaps the springs for the .380s are under powered from the factory and Kahr needs to increase the spring rates during manufacture.

    just say'n, based on my CM9 experience.

    NRA LIFER
    IDPA BELEIVER
    I too have a decent round count through my CM9 with no indication that the mag springs or the recoil spring are getting weak.

    The cw380 mag springs, on the other hand, have weakened and lost their rebound much quicker.

  2. #12
    Join Date
    Aug 2017
    Posts
    118

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    Owning and shooting many different semi auto pistols, for many thousands of rounds, the only one that I have ever had to change mag springs on was a Bersa Thunder 380. Hope that stays true with my CM9.

  3. #13
    Join Date
    Feb 2014
    Posts
    163

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    Quote Originally Posted by DJK11 View Post
    Dust, as an experiment, one could cut a 9mm spring and give it try in a 380 mag. It slides in just fine. Modify the end to seat under the follower. Cut the coils to fit in the mag so it will cycle then trim one coil at a time. Hell maybe I'll try it!
    I just tried it with a spring from a cm9 mag. It fits in the mag body but doesn't seat properly in the follower. I was Abe to put the base on. 5 rounds fit.

    Definitely stiffer, but it also seemed to have a lot of friction. It felt sluggish on rebound. I think the coils we're dragging against the inside.

  4. #14
    Join Date
    Jul 2017
    Location
    La Habra, California
    Posts
    42

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    Quote Originally Posted by dustnchips View Post
    Last time at the range my CW380 failed to lock open on final round a few times. I checked and the stop was not being pushed all the way into the slot. The mag spring is now only about an inch longer than the mag.


    You're not the only one with this problem. The cause is obvious, and the solution simple.

    The original spring for the six round magazine is marginal, at best, and just can't reliably move the slide stop. The spring for the seven round magazine has two more coils, and it fits perfectly into the six round magazine. It gives a little extra oomph to push the slide stop all the way up into the notch of the slide.

    A good magazine should last decades with regular use, and a spring that fails in the space of a few months -- or years -- wasn't good enough to begin with.

    If you're having a problem, give Kahr technical support a call, and ask them to send you out the upgraded spring.

  5. #15
    Join Date
    Apr 2013
    Posts
    320

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    Interesting, but I was looking at Kahr recoil springs on Midway's website and I saw this user review who only gave the Kahr springs 1 star out of 5:

    I have owned 8 Kahr pistols in 9, 40, and 45. These are great pistols to shoot but the 40 and 45s dont work. And good luck if you have to send it back to Kahr.The main thing wrong with these guns, after 3 years of study, is the Kahr springs are junk. I set my P45 back 3 times and my friend sent his back 5 times. They will work for a short while until the springs take a set, then wont work. You can take these springs and bend them into kinks with your bare hands. The new one wil be 2 inches longer than to old one, but if you take the new one and compress it fully over a phillips head screwdriver locked in a vise for 20 minutes, it will be 1.5 inches shorter. Colt or Ruger springs will not do this. Good quality springs wont do this. My Lt gave me a spring from a Glock 22 and we cut off 2 coils and it works 100%
    https://www.midwayusa.com/product/99...r-cw45-k40-p45

  6. #16
    Join Date
    Sep 2009
    Location
    Wet & Wild Pacific NW
    Posts
    26,971

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    Funny thing, I've never had any issues of this nature with any of my 3 Kahrs or the half dozen that officers are carrying around here.

    Far as I know Wolff makes all the springs and generally they don't get any better than that.
    http://bawanna45.wix.com/bawannas-grip-emporium#!
    In Memory of Paul "Dietrich" Stines.
    Dad: Say something nice to your cousin Shirley
    Dietrich: For a fat girl you sure don't sweat much.
    Cue sound of Head slap.

    RIP Muggsy & TMan

  7. #17
    Join Date
    Apr 2013
    Posts
    320

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    I keep seeing everyone say that Wolff makes their springs, but is that really true or is it merely a dated assumption? Kahr may have used Wolff for a supplier in the early days, but they may have switched vendors since then.

  8. #18
    Join Date
    Nov 2010
    Location
    SE Michigan
    Posts
    280

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    Of my dozen or so Kahr mags, thousands of rounds and leaving some fully loaded for years, I've never had mag problems. A few years ago I phoned Wollf Spring and spoke to a guy about pm45 springs. He said " I've never seen a pm45 and Kahr is a pita to work with because they are constantly changing the specs on the pieces we supply them."

    It's odd that my 380 and 9 mm use different springs based on capacity but my 5,6 and 7 rnd 45 mags use the same springs.
    Last edited by DJK11; 10-15-2017 at 06:06 AM. Reason: ?
    KP3833N, PM9093N, PM4544N old slide, PM4543N, TP4543, XD9SC, P22, Just Right Carbine 45 ACP marine takedown, Glock 41

  9. #19
    Join Date
    Jan 2016
    Location
    wisconsin
    Posts
    283

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    I think everyone can agree that Kahr springs are hit and miss as to quality. I hope my maggots arrive Monday. I to wish they would make them for the PM9.

  10. #20

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    There is a place on Magguts website where you can request kits for pistols they don't make yet. I've done it previously. Maybe if all of us here would do it, it might make a difference.

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